diff --git a/docs/configuration.ja.md b/docs/configuration.ja.md
index 6c69337..2aed5b4 100644
--- a/docs/configuration.ja.md
+++ b/docs/configuration.ja.md
@@ -123,6 +123,7 @@ piece: default                # このプロジェクトの現在の piece
 provider: claude              # このプロジェクトの provider 上書き
 auto_pr: true                 # worktree 実行後に PR を自動作成
 verbose: false                # 詳細出力モード
+concurrency: 2                # このプロジェクトでの takt run 並列タスク数（1-10）
 
 # provider 固有オプション（グローバルを上書き、piece/movement で上書き可能）
 # provider_options:
@@ -145,6 +146,7 @@ verbose: false                # 詳細出力モード
 | `provider` | `"claude"` \| `"codex"` \| `"opencode"` \| `"mock"` | - | provider 上書き |
 | `auto_pr` | boolean | - | worktree 実行後に PR を自動作成 |
 | `verbose` | boolean | - | 詳細出力モード |
+| `concurrency` | number (1-10) | `1`（global 設定由来） | `takt run` の並列タスク数 |
 | `provider_options` | object | - | provider 固有オプション |
 | `provider_profiles` | object | - | provider 固有のパーミッションプロファイル |
 
diff --git a/docs/configuration.md b/docs/configuration.md
index 7c72576..22eda07 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -123,6 +123,7 @@ piece: default                # Current piece for this project
 provider: claude              # Override provider for this project
 auto_pr: true                 # Auto-create PR after worktree execution
 verbose: false                # Verbose output mode
+concurrency: 2                # Parallel task count for takt run in this project (1-10)
 
 # Provider-specific options (overrides global, overridden by piece/movement)
 # provider_options:
@@ -145,6 +146,7 @@ verbose: false                # Verbose output mode
 | `provider` | `"claude"` \| `"codex"` \| `"opencode"` \| `"mock"` | - | Override provider |
 | `auto_pr` | boolean | - | Auto-create PR after worktree execution |
 | `verbose` | boolean | - | Verbose output mode |
+| `concurrency` | number (1-10) | `1` (from global) | Parallel task count for `takt run` |
 | `provider_options` | object | - | Provider-specific options |
 | `provider_profiles` | object | - | Provider-specific permission profiles |
 
diff --git a/src/__tests__/config-env-overrides.test.ts b/src/__tests__/config-env-overrides.test.ts
index f92883a..69d7500 100644
--- a/src/__tests__/config-env-overrides.test.ts
+++ b/src/__tests__/config-env-overrides.test.ts
@@ -53,12 +53,14 @@ describe('config env overrides', () => {
 
   it('should apply project env overrides from generated env names', () => {
     process.env.TAKT_VERBOSE = 'true';
+    process.env.TAKT_CONCURRENCY = '3';
     process.env.TAKT_ANALYTICS_EVENTS_PATH = '/tmp/project-analytics';
 
     const raw: Record<string, unknown> = {};
     applyProjectConfigEnvOverrides(raw);
 
     expect(raw.verbose).toBe(true);
+    expect(raw.concurrency).toBe(3);
     expect(raw.analytics).toEqual({
       events_path: '/tmp/project-analytics',
     });
diff --git a/src/__tests__/config.test.ts b/src/__tests__/config.test.ts
index b1f54cc..116849a 100644
--- a/src/__tests__/config.test.ts
+++ b/src/__tests__/config.test.ts
@@ -1246,6 +1246,14 @@ describe('saveProjectConfig snake_case denormalization', () => {
     expect((saved as Record<string, unknown>).base_branch).toBeUndefined();
   });
 
+  it('should persist concurrency and reload correctly', () => {
+    saveProjectConfig(testDir, { piece: 'default', concurrency: 3 });
+
+    const saved = loadProjectConfig(testDir);
+
+    expect(saved.concurrency).toBe(3);
+  });
+
   it('should not write camelCase keys to YAML file', () => {
     saveProjectConfig(testDir, { piece: 'default', autoPr: true, draftPr: false, baseBranch: 'develop' });
 
@@ -1261,7 +1269,7 @@ describe('saveProjectConfig snake_case denormalization', () => {
   });
 });
 
-describe('resolveConfigValue autoPr/draftPr/baseBranch from project config', () => {
+describe('resolveConfigValue autoPr/draftPr/baseBranch/concurrency from project config', () => {
   let testDir: string;
   let originalTaktConfigDir: string | undefined;
 
@@ -1309,4 +1317,12 @@ describe('resolveConfigValue autoPr/draftPr/baseBranch from project config', ()
 
     expect(resolveConfigValue(testDir, 'baseBranch')).toBe('main');
   });
+
+  it('should resolve concurrency from project config', () => {
+    const projectConfigDir = getProjectConfigDir(testDir);
+    mkdirSync(projectConfigDir, { recursive: true });
+    writeFileSync(join(projectConfigDir, 'config.yaml'), 'concurrency: 3\n');
+
+    expect(resolveConfigValue(testDir, 'concurrency')).toBe(3);
+  });
 });
diff --git a/src/__tests__/opencode-config.test.ts b/src/__tests__/opencode-config.test.ts
index 31582ab..6be44a4 100644
--- a/src/__tests__/opencode-config.test.ts
+++ b/src/__tests__/opencode-config.test.ts
@@ -36,6 +36,11 @@ describe('Schemas accept opencode provider', () => {
     expect(result.provider).toBe('opencode');
   });
 
+  it('should accept concurrency in ProjectConfigSchema', () => {
+    const result = ProjectConfigSchema.parse({ concurrency: 3 });
+    expect(result.concurrency).toBe(3);
+  });
+
   it('should accept opencode in CustomAgentConfigSchema', () => {
     const result = CustomAgentConfigSchema.parse({
       name: 'test',
diff --git a/src/core/models/persisted-global-config.ts b/src/core/models/persisted-global-config.ts
index 972114e..699f498 100644
--- a/src/core/models/persisted-global-config.ts
+++ b/src/core/models/persisted-global-config.ts
@@ -137,6 +137,8 @@ export interface ProjectConfig {
   providerOptions?: MovementProviderOptions;
   /** Provider-specific permission profiles */
   providerProfiles?: ProviderPermissionProfiles;
+  /** Number of tasks to run concurrently in takt run (1-10) */
+  concurrency?: number;
   /** Base branch to clone from (overrides global baseBranch) */
   baseBranch?: string;
 }
diff --git a/src/core/models/schemas.ts b/src/core/models/schemas.ts
index 092cede..e04f782 100644
--- a/src/core/models/schemas.ts
+++ b/src/core/models/schemas.ts
@@ -494,6 +494,8 @@ export const ProjectConfigSchema = z.object({
   model: z.string().optional(),
   provider_options: MovementProviderOptionsSchema,
   provider_profiles: ProviderPermissionProfilesSchema,
+  /** Number of tasks to run concurrently in takt run (default from global: 1, max: 10) */
+  concurrency: z.number().int().min(1).max(10).optional(),
   /** Base branch to clone from (overrides global base_branch) */
   base_branch: z.string().optional(),
 });
diff --git a/src/infra/config/env/config-env-overrides.ts b/src/infra/config/env/config-env-overrides.ts
index ae2b1ce..99bb8ca 100644
--- a/src/infra/config/env/config-env-overrides.ts
+++ b/src/infra/config/env/config-env-overrides.ts
@@ -132,6 +132,7 @@ const PROJECT_ENV_SPECS: readonly EnvSpec[] = [
   { path: 'piece', type: 'string' },
   { path: 'provider', type: 'string' },
   { path: 'verbose', type: 'boolean' },
+  { path: 'concurrency', type: 'number' },
   { path: 'analytics', type: 'json' },
   { path: 'analytics.enabled', type: 'boolean' },
   { path: 'analytics.events_path', type: 'string' },
diff --git a/src/infra/config/types.ts b/src/infra/config/types.ts
index 7dbd7f6..3a2bc51 100644
--- a/src/infra/config/types.ts
+++ b/src/infra/config/types.ts
@@ -20,6 +20,8 @@ export interface ProjectLocalConfig {
   baseBranch?: string;
   /** Verbose output mode */
   verbose?: boolean;
+  /** Number of tasks to run concurrently in takt run (1-10) */
+  concurrency?: number;
   /** Project-level analytics overrides */
   analytics?: AnalyticsConfig;
   /** Provider-specific options (overrides global, overridden by piece/movement) */