To feed an air-conditioning wind to a 100% front wind shield in a DEF mode, as a blowout port mode, without increasing a cost.

A side FACE opening communicated with a side FACE blowout port is divided into two with a partitioning plate 19 in an air-conditioning case 4 and a DEF opening 14 communicated with a DEF blowout port is provided adjacent to each FACE opening. A portion, equivalent to a second side FACE opening 13, of a FACE door 16 is cut off in part and the second side FACE opening 13 is thereby closed with a DEF door 17 only in a DEF mode. An air-conditioning unit 1, if possibly causing the leakage of an air-conditioning wind from the side FACE blowout port in another blowout port mode, is thus prevented from causing the leakage of an air-conditioning wind from the side FACE blowout port in a DEF mode, so that a 100% air-conditioning wind may be blown to a front wind shield only from the DEF blowout port.