Patent ID: 8467274

Claim:
A hand position detecting device comprising: a first gear rotating interlockingly with a minute hand; a second gear rotating interlockingly with a second hand and rotating about a same rotational axis as the first gear; a first detection target portion that is provided at a predetermined radial position of the first gear and identifiable by light irradiation; a second detection target portion that is provided at a radial position of the second gear so as to be overlapped with the first detection target portion and identifiable by light irradiation; and a detector for detecting on the basis of irradiated light whether the first detection target portion and the second detection target portion are set to be overlapped with each other at a predetermined detection position, wherein the second detection target portion is formed to be divided into a plurality of parts over a predetermined angular range out of a center angle of 360° of the second gear, and a presence-or-absence pattern of the second detection target portion in an angular range of successive N (N represents one of 5 to 10) angular segments each having a center angle of 12° with any angular segment being set as a start point is made different when the angular segment of the start point is different.