Reciprocating display mechanism and timepiece

A reciprocating display mechanism that performs predetermined display by reciprocating a hand within a fixed area, the reciprocating display mechanism comprising:

• the hand capable of reciprocating within the fixed area;
• a hand-driving wheel that drives the hand and comprises a first wheel, the first wheel comprising a first surface extending generally along a radius of the first wheel, the hand-driving wheel comprising a projection extending from the first surface;
• a transmission wheel that rotates the hand-driving wheel by engaging with a tooth of the first wheel;
• and
• a biasing member that biases the hand in one direction via the projection at a predetermined rotational position of the hand-driving wheel, wherein
• the first wheel comprises an angle area corresponding to the fixed area and a region adjacent to the angle area, the angle area being provided with teeth and a part of the region adjacent to the angle area being provided with an idle region in which the transmission wheel idles, and
• the one direction that biases by the biasing member is a direction in which the tooth adjacent to the idle region engages with the transmission wheel when the idle region faces the transmission wheel.