Patent ID: 8491181

Claim:
A chronograph timepiece comprising: a plurality of heart cams that are attached by being fitted to a plurality of chronograph stems; a start-stop button; a reset-to-zero button; a start-stop lever that is operated by the start-stop button to undergo rotation around a common rotation center positioned between the start-stop button and the reset-to-zero button in a circumferential direction of a timepiece main body; a reset-to-zero instruction lever that is operated by the reset-to-zero button to undergo rotation around the common rotation center; a hammer operating lever having one end that undergoes rotation in a first direction when the start-stop lever rotates by operation of the start-stop button, the one end undergoing rotation in a second direction when the reset-to-zero instruction lever rotates by operation of the reset-to-zero button; and a hammer lever that causes the plurality of heart cams to be reset to zero by bringing hammer portions of the hammer lever into engagement with respective ones of the plurality of heart cams when another end of the hammer operating lever rotates in a reset-to-zero instruction direction according to rotation of the hammer operating lever in the second direction; wherein the plurality of hammer portions are disengaged from respective ones of the plurality of heart cams when the another end of the hammer operating lever rotates in a start-stop direction according to rotation of the hammer operating lever in the first direction.