An air conditioner that, even if a drain passage for condensed water straddles a portion where condensation by cooling is not desired, can avoid cooling of the portion. The air conditioner has a rear An air conditioner that, even if a drain passage for condensed water straddles a portion where condensation by cooling is not desired, can avoid cooling of the portion. The air conditioner has a rearheat exchanger (10b), a rear drain pan (70), and guide ribs (76a to 76c). The rear drain pan (70) has a vertical surface part (75), an upper drain pan (72), and a lower drain pan (77). The vertical suheat exchanger (10b), a rear drain pan (70), and guide ribs (76a to 76c). The rear drain pan (70) has a vertical surface part (75), an upper drain pan (72), and a lower drain pan (77). The vertical surface part (75) is a member expanding generally vertically. The upper drain pan (72) extends from the upper end toward one side when viewed from the vertical surface part (75). The lower drain pan (77rface part (75) is a member expanding generally vertically. The upper drain pan (72) extends from the upper end toward one side when viewed from the vertical surface part (75). The lower drain pan (77) extends from a low position toward the other side on the generally opposite side of one side of the vertical surface part (75). The rear drain pan (70) is obliquely disposed so that condensed water) extends from a low position toward the other side on the generally opposite side of one side of the vertical surface part (75). The rear drain pan (70) is obliquely disposed so that condensed watergenerated in the rear heat exchanger (10b) is received by the upper drain pan (72), led over the vertical surface part (75), and guided to an outlet (80) through the lower drain pan (77). The guide rigenerated in the rear heat exchanger (10b) is received by the upper drain pan (72), led over the vertical surface part (75), and guided to an outlet (80) through the lower drain pan (77). The guide ribs (76a to 76c) are formed so as to extend from near the upper end of the vertical surface part (75) toward the other side.bs (76a to 76c) are formed so as to extend from near the upper end of the vertical surface part (75) toward the other side.