To inexpensively provide a plate spring and a lens drive mechanism each having improved impact resistance.
The plate spring 22 comprises an annular inner periphery side end part 221, an outer periphery side end part 222 isolated from the inner periphery side end part and having a larger radius than the inner periphery side end part, N-pieces of arm parts 223 provided along the peripheral direction for connecting the inner periphery side end part to the outer periphery side end part, N-pieces of inner periphery side connection parts 224 protruded from the inner periphery side end part to the radial outside for connecting the inner periphery side end part to the N-pieces of arm parts, and N-pieces of outer periphery side connection parts 225 protruded from the outer periphery side end part to the radial inside for connecting the outer periphery side end part to the N-pieces of arm parts. At least one of a plate width (a) of an inner periphery side root portion 223a of the arm part 223 and a plate width (b) of an outer periphery side root portion 223b is greater than a plate width (c) of a longitudinal center portion 223c of the arm part 223.
Shuichi Fukuda
Takashi Sasaki