In a camera, a first cam is rotated to assume a rotational phase at which drive of a first shutter blade set with a first drive force is not hindered and a second drive force charge cam face in contact with a second charge member charges a second drive force as a rotating shaft is caused to rotate to a first rotational phase. A second drive force charge cam in contact with the second charge member sustains a second drive force charging state period in which the shaft in the first rotational phase rotates to a second rotational phase. A first drive force charge cam face in contact with the first charge member charges the first drive force and the second cam face in contact with the second charge member charges the second drive force as the shaft rotates from the first rotational phase to the second rotational phase.