PURPOSE: To make a uniform distribution of flow speed in a heat exchanger, improve a heat exchanging characteristic and reduce noise in an indoor unit of a transverse flow type blower by a method wherein a vane wheel of the blower is arranged near a center of a length of stepwise direction of a heat exchanger.

CONSTITUTION: An indoor unit is divided into some sections with a length of a step-wise direction of a heat exchanger 2 being divided in a range from 1:2W1:1 by a method wherein a center of axis of a vane wheel 1 of a blower is applied as an origin and y-axis 10 is crossed at a right angle with x-axis 9 in parallel with a heat exchanger 2. The heat exchange 2 and the vane wheel 1 are arranged within a main body 8 of the indoor unit in such a way as a blowing port 12 of the vane wheel 1 is approached in a direction where an area of the divided heat exchanger 2 is small. A stabilizer 4 is extended up to the blowing port 12 to form a separator 12. Each of a suction air passage 14 and a blowing air passage 13 is formed and the blowing air passage 13 is formed as a static pressure recovery air passage having a diffuser shape.