An incubator includes: an insulated box including an incubation space surrounded by multiple inner faces; a humidifying unit that humidifies an incubation space; a first heating unit that heats a first inner face among the multiple inner faces, with electric power supplied; a second heating unit that heats a second inner face, different from the first inner face, with electric power supplied; and a control unit that controls the magnitude of electric power supplied to each of the first heating unit and the second heating unit. The control unit repeatedly changes the magnitude of electric power supplied to the first heating unit at first timing, and also repeatedly changes the magnitude of electric power supplied to the second heating unit at second timing different from the first timing.