A washing machine comprising: a tub; a water supply valve for controlling an inflow of wash water; a liquid detergent supply unit for supplying liquid detergent; and a liquid detergent mixing unit connected to the water supply valve to receive wash water and connected to the liquid detergent supply unit to receive liquid detergent, the wash water and the liquid detergent being mixed and guided to the tub, wherein the liquid detergent mixing unit comprises: a main body defining a mixing space in which the wash water and the liquid detergent are mixed; a detergent inlet pipe connected to the liquid detergent supply unit to guide liquid detergent into the main body; a wash water inlet pipe (143; 243) connected to the water supply valve and having one end protruding from the one side surface of the main body to the mixing space to guide wash water to the mixing space; and a wash water dispersing unit (144; 244) protruding from an opposite side surface to the one side surface of the main body into the mixing space to contact the one end of the wash water inlet pipe, characterized in that: the liquid detergent mixing unit further comprises a vent pipe for discharging air out of the mixing space. a tub; a water supply valve for controlling an inflow of wash water; a liquid detergent supply unit for supplying liquid detergent; and a liquid detergent mixing unit connected to the water supply valve to receive wash water and connected to the liquid detergent supply unit to receive liquid detergent, the wash water and the liquid detergent being mixed and guided to the tub, wherein the liquid detergent mixing unit comprises: a main body defining a mixing space in which the wash water and the liquid detergent are mixed; a detergent inlet pipe connected to the liquid detergent supply unit to guide liquid detergent into the main body; a wash water inlet pipe (143; 243) connected to the water supply valve and having one end protruding from the one side surface of the main body to the mixing space to guide wash water to the mixing space; and a wash water dispersing unit (144; 244) protruding from an opposite side surface to the one side surface of the main body into the mixing space to contact the one end of the wash water inlet pipe, characterized in that: the liquid detergent mixing unit further comprises a vent pipe for discharging air out of the mixing space. a main body defining a mixing space in which the wash water and the liquid detergent are mixed; a detergent inlet pipe connected to the liquid detergent supply unit to guide liquid detergent into the main body; a wash water inlet pipe (143; 243) connected to the water supply valve and having one end protruding from the one side surface of the main body to the mixing space to guide wash water to the mixing space; and a wash water dispersing unit (144; 244) protruding from an opposite side surface to the one side surface of the main body into the mixing space to contact the one end of the wash water inlet pipe, characterized in that: the liquid detergent mixing unit further comprises a vent pipe for discharging air out of the mixing space. the liquid detergent mixing unit further comprises a vent pipe for discharging air out of the mixing space.