PURPOSE: To electrically connect electric equipment disposed inside a cabin to a power source cable with ease by applying, to a unit case, a function as a relay box for supplying a current from a battery to the electric equipment.

CONSTITUTION: A vehicular air conditioner 10 is disposed in a lower space of an instrument panel P. A connection coupler 50 is connected to a first connection portion 47 of a unit case 45 via a power source cable 46 drawn into a cabin. A coupler 53, to which a lead wire 52 is connected, is connected to a second connecting portion 48 of the unit case 45. The lead wire 52 is embedded in a third connection portion 49 inside a wall 45a of the unit case 45, for electrically connecting the connection portions 47, 48. Consequently, the connection portions 47, 48 can connect the couplers 50, 53 in a single operation because of its connector structure. The unit case 45 can function as a relay box for supplying a current from a battery to electric equipment E.