A radiator tank is provided to prevent an inlet pipe and an outlet pipe from being separated and prevent damage to a fixing part and improve durability by having high bonding strength without lowering distance between the fixing parts. A radiator tank comprises a first fixing part(121) and a second fixing part(122) which are protruded to fix an inlet pipe(220) or an outlet pipe(230) parallel to a longitudinal direction of a radiator tank. The first and second fixing parts comprise: a clearance portion(123) isolating the pipe from the radiator tank(100) at constant distance; a mounting portion(125) formed in the upper part of the clearance portion in order to corresponding to the boundary surface of the pipe; an insertion portion(124) having a slope to the mounting portion; and an extension portion extended to the upper part of the mounting portion and the insertion portion.
