A clothes treatment apparatus comprising: a cabinet partitioned into a treatment chamber for allowing clothes to be hung therein, and a cycle chamber for allowing machinery to be installed therein; a door for opening and closing the cabinet; wherein a tank module frame is located below the treatment chamber, wherein the tank module frame is disposed between the cycle chamber and the door, wherein the tank module frame comprises a tank installation space to allow a water supply tank and a drainage tank to be installed therein, wherein the tank module frame is arranged to partition the tank installation space from the cycle chamber, a steam unit disposed in the cycle chamber for supplying steam into the treatment chamber; a heat pump unit disposed in the cycle chamber for circulating air in the treatment chamber and conditioning the air that is circulated; wherein the water supply tank is separably installed in the tank module frame and is connected to the steam unit, configured to supply water to the steam unit, wherein the drainage tank is separably installed in the tank module frame, configured to store condensed water generated in at least one selected from between the treatment chamber and the heat pump unit, and wherein each of the water supply tank and the drainage tank comprises: a tank body open at a front thereof and the upper side of the tank body being round; a tank cover coupled to the front of the tank body to define a water-storing space; and a grip disposed at an upper side of a front side of the water supply tank and concaved from each front of the water supply tank and the drainage tank to a rear of the water supply tank and the drainage tank, wherein the tank cover and the grip are exposed to a user when the door is open, and each of the water supply tank and the drainage tank is separated from or installed in the tank module frame by a user. a cabinet partitioned into a treatment chamber for allowing clothes to be hung therein, and a cycle chamber for allowing machinery to be installed therein; a door for opening and closing the cabinet; wherein a tank module frame is located below the treatment chamber, wherein the tank module frame is disposed between the cycle chamber and the door, wherein the tank module frame comprises a tank installation space to allow a water supply tank and a drainage tank to be installed therein, wherein the tank module frame is arranged to partition the tank installation space from the cycle chamber, a steam unit disposed in the cycle chamber for supplying steam into the treatment chamber; a heat pump unit disposed in the cycle chamber for circulating air in the treatment chamber and conditioning the air that is circulated; wherein the water supply tank is separably installed in the tank module frame and is connected to the steam unit, configured to supply water to the steam unit, wherein the drainage tank is separably installed in the tank module frame, configured to store condensed water generated in at least one selected from between the treatment chamber and the heat pump unit, and wherein each of the water supply tank and the drainage tank comprises: a tank body open at a front thereof and the upper side of the tank body being round; a tank cover coupled to the front of the tank body to define a water-storing space; and a grip disposed at an upper side of a front side of the water supply tank and concaved from each front of the water supply tank and the drainage tank to a rear of the water supply tank and the drainage tank, a tank body open at a front thereof and the upper side of the tank body being round; a tank cover coupled to the front of the tank body to define a water-storing space; and a grip disposed at an upper side of a front side of the water supply tank and concaved from each front of the water supply tank and the drainage tank to a rear of the water supply tank and the drainage tank,