A hand insertion door board is attached to the peripheral portion of each hand insertion window formed in an outside portion of a newborn infant container of an incubator. A holding portion is formed on one side portion of the hand insertion door board in the lateral direction. A bracket which pivotally supports a support shaft having a vertical axis is attached to the holding portion. A latch lever is pivotally supported by the support shaft of the bracket. A press lever which releases latching operation of the latch lever is pivotally attached by using the support shaft of the bracket. When the press lever is pressed against the biasing force of a compression coil spring, the press lever presses projecting pieces of the latch lever to make the latch lever pivot about the support shaft to the release position.
