A mirror angle controller is provided which includes a pivot plate (H) which is attached to a reverse side of a mirror (M), and an actuator (A) which holds the pivot plate (H), in which the actuator (A) includes a housing (A1), a rod (A3) which pushes and pulls the pivot plate (H), and a motor which provides driving force to the rod (A3), in which, a ringed holder (121) which is placed to surround the rod (A3) is formed in the housing (A1), and in which the pivot plate (H) includes a ringed sliding part (H31) which is contact with and arbitrarily slides on the holder (121), and an engaging part which is engaged with an end of the rod (A3) so as to securely hold the mirror (M).