To suppress stress concentration in the vicinity of fastening members in a structure where a disk-like pulsar plate is fastened to a mounting surface formed of a crank web and a counter weight and orthogonal to a crank axial line by at least three fastening members.

A pulsar plate 7 includes a plate-like inner circumferential side portion 12 where an insertion hole 11 is formed, and a plate-like outer circumferential side portion 14 continuously provided via an annular step part 13. In the annular step part 13, a protruding part 13b is formed which protrudes to the outside in a radial direction partially in a circumferential direction. The protruding part 13b is provided in a position overlapped in a circumferential direction with at least one (first insertion hole 11a) of two insertion holes 11a, 11b which are provided to be adjacent to both circumferential ends 5b of an end face 5a of the counter weight 5.