INDOOR UNIT OF AIR CONDITIONER

To provide an indoor unit of an air conditioner suppressing an inside of an airtight space from having concentration of a combustible limit or more in a short time when refrigerant leakage is caused, while detecting the refrigerant leakage.SOLUTION: An indoor unit 10 of an air conditioner includes: a housing 15; a heat exchanger 17 disposed in the housing 15; a first refrigerant pipe 70 disposed in the housing 15 and passing through the heat exchanger 17; a connection part 75 connecting the first refrigerant pipe 70 and a second refrigerant pipe 71 drawn from the outside of the housing 15; and a retention part 68 as a space for housing the connection part 75. And the device includes: a refrigerant leakage detection flow path 80 communicating the retention part 68 and a negative pressure space; and a refrigerant leakage detection means 58 detecting refrigerant flowing through the refrigerant leakage detection flow path 80.SELECTED DRAWING: Figure 5 【課題】冷媒漏洩を検知しつつ、冷媒漏洩が生じたときに、密閉空間内が短時間で可燃性限界以上の濃度になることを抑制できる空気調和装置の室内機を提供する。【解決手段】筐体１５と、筐体１５内に配置された熱交換器１７と、筐体１５内に配置され熱交換器１７を通過する第１冷媒配管７０と、この第１冷媒配管７０と筐体１５の外部から引き回す第２冷媒配管７１とを接続する接続部７５と、この接続部７５を収容する空間である滞留部６８と、を備える空気調和装置の室内機１０であって、滞留部６８と負圧空間とを連通する冷媒漏洩検知流路８０と、冷媒漏洩検知流路８０を流れる冷媒を検知する冷媒漏洩検知手段５８を備えた。【選択図】図５