Provided is a laundry treating apparatus comprising a drum including: a drum body defining a space to store laundry therein, a front cover, a rear cover, and a drum introduction opening defined at the front cover and configured to communicate with an inside of the drum body; a drying unit configured to supply heated air to the drum body; a fixing panel; a power transmission unit including: a housing, an input shaft, an output shaft, and a gear unit disposed in the housing and configured to transmit rotational motion of the input shaft to the output shaft; a motor comprising including: a stator, and a rotor; and a heat insulation part made of a material having heat conductivity lower than heat conductivity of the housing and configured to reduce an amount of heat that is transferred from the outside of the housing to an inside of the housing.