An air conditioner includes a main body, a fan configured to cause air to flow through the main body, and a water reservoir detachably disposed on an upper portion of the main body. A humidifying fabric member is disposed inside the main body and configured to receive water from the water reservoir. A water collecting tank is configured to collect water that flows down from the humidifying fabric member. In addition, a pump is configured to pump the water in the water collecting tank to the water reservoir through a suction hole. A bottom of the water collecting tank is formed to be downwardly inclined toward one portion of the bottom and the suction hole of the pump is disposed adjacent to the one portion.