ACTUATOR

To visually recognize brightness of a lighting fixture clearly and in detail.SOLUTION: An actuator includes an operation unit that operates brightness B, and a display portion that displays the brightness B as a length, and the display portion includes n (n is a natural number of 2 or more) display elements Dk|k=1 to n (k is a natural number of n or less), the display elements Dk|k=1 to n are arranged in the order of D1 to Dn as a level of the brightness B goes from a low level side to a high level side, and when Bmax is the maximum value of brightness B, Bd is the value (real number) obtained by dividing Bmax by n, Q is the quotient when B is the dividend and Bd is the divisor, R is the remainder, and Pmax is the maximum output of Dk|k=1 to n, the output Pk|k=Q+1 of Dk|k=Q+1 is a value Pr calculated based on the remainder R, and the output Pk|k