In an incubator (11) according to the present invention, physical condition of a newborn is less likely to get out of order though a hand insertion window (33) can easily be opened by operation with, for example, an elbow instead of a hand. A latch (41) in a latch mechanism (35) has a spiral face (46) that extends to at least part of the periphery of a rotation shaft (44) that extends along a side of a newborn chamber (16). A releasing member (43) in the latch mechanism (35) presses the spiral face (46) of the latch (41) by movement along the side of the newborn chamber (16) and rotates the latch (41) from a holding position to a releasing position for a hand insertion door (34). In addition, even if the latch (41) in the latch mechanism (35) rotates about the rotation shaft (44) between the holding and releasing positions for the hand insertion door (34), the releasing member (43) does not rotate.
