PURPOSE: To reduce the size and thickness of a watch having a time correcting mechanism by containing the interlock of a zero setting mechanism in predetermined space thereof.

CONSTITUTION: In the space 29 of a watch formed by day back flange 25 and third gear 23 disposed on the same shaft is contained a zero resetting lever 1 forming the interlock of a mechanism for resetting a second hand to zero through fourth and fifth gears by rotating a heart cam 6 connected through the shaft 9 of a time correcting mechanism having a correcting flange 19, a coupling member 8, a correcting shaft 9, and an intermediate gear 21 for correcting the time in mesh with the flange 19. The watch can be reduced in its size and thickness by the constitution utilizing the space.