A dehumidifier which comprises dehumidifying means configured for removing moisture contained in the air; air blowing means configured for drawing in room air and blowing out dry air, which is obtained by causing the room air to pass through the dehumidifying means, into a room; wind direction changing means configured for changing a blowing direction of the dry air; surface temperature detection means configured for detecting surface temperatures of an object present in the blowing direction of the wind direction changing means in a non-contact state; and control means configured for controlling the blowing direction of the wind direction changing means and reading the surface temperatures detected by the surface temperature detection means, characterized in that the wind direction changing means is configured for changing the blowing direction of the dry air vertically and laterally, the surface temperature detection means is attached to the wind direction changing means, and the control means is configured for, upon detection of the start of a removal operation of dew condensation in the room, controlling the blowing direction of the wind direction changing means so that the surface temperature detection means moves on a predetermined route in a surface temperature detection range which is divided into a plurality of blocks and is obtained by changing the blowing direction of the wind direction changing means vertically and laterally, and also reading the surface temperatures on the predetermined route detected by the surface temperature detection means, and selecting the lowest surface temperature from the read surface temperatures and controlling the wind direction changing means so that the dry air is blown in the direction of the lowest surface temperature wherein the control means is configured for, in blowing the dry air in the direction of the lowest surface temperature, setting an area of a predetermined range which is composed of the block of the lowest surface temperature and the blocks in a predetermined range enclosing the block of the lowest surface temperature, and controlling the wind direction changing means so that the dry air is blown into each block in the area sequentially. air blowing means configured for drawing in room air and blowing out dry air, which is obtained by causing the room air to pass through the dehumidifying means, into a room; wind direction changing means configured for changing a blowing direction of the dry air; surface temperature detection means configured for detecting surface temperatures of an object present in the blowing direction of the wind direction changing means in a non-contact state; and control means configured for controlling the blowing direction of the wind direction changing means and reading the surface temperatures detected by the surface temperature detection means, the wind direction changing means is configured for changing the blowing direction of the dry air vertically and laterally, the surface temperature detection means is attached to the wind direction changing means, and the control means is configured for, upon detection of the start of a removal operation of dew condensation in the room, controlling the blowing direction of the wind direction changing means so that the surface temperature detection means moves on a predetermined route in a surface temperature detection range which is divided into a plurality of blocks and is obtained by changing the blowing direction of the wind direction changing means vertically and laterally, and also reading the surface temperatures on the predetermined route detected by the surface temperature detection means, and selecting the lowest surface temperature from the read surface temperatures and controlling the wind direction changing means so that the dry air is blown in the direction of the lowest surface temperature wherein the control means is configured for, in blowing the dry air in the direction of the lowest surface temperature, setting an area of a predetermined range which is composed of the block of the lowest surface temperature and the blocks in a predetermined range enclosing the block of the lowest surface temperature, and controlling the wind direction changing means so that the dry air is blown into each block in the area sequentially.