An infant incubator including: a bed of an infant; a first supporting-shaft disposed obliquely above the bed, extends substantially horizontally, and rotatable back and forth at a predetermined extent around an axis; a rotation stay fixed to and rotated with the first supporting-shaft; a second supporting-shaft provided with the rotation stay and parallel to the first supporting-shaft; and a heater disposed obliquely above the bed, attached to the rotation stay rotatably back and forth at a predetermined extent around the second supporting-shaft, and configured to emit a heat ray obliquely to an upper surface of the bed, wherein a position of the heater can be varied between a heating position for emitting the heat ray and a folding position for moving away from above the bed; and at the heating position, an emission angle of the heat ray from the heater is further varied.