Air conditioning apparatus for vehicle

A receiving recess groove for a waterproof member is formed on a separation surface of a bottom portion in a unit case (2) of a vertical-split type constituted by at least two case members (10,20) having the separation surface, along the separation surface. A rod-like waterproof member having an elasticity is received within the receiving recess groove in a compressed state. Then, in the unit case, a storage gap positioned in an inner wall surface side of the unit case among gaps with respect to the waterproof member within the receiving recess groove and through which a water enters from the inner portion of the unit case, and a communicating portion for communicating with the inner portion of the unit case are respectively provided at both end portions of the receiving recess groove.