An easy assembled ratchet wrench contains a body including a head portion disposed on at least one end thereof, the head portion including a first chamber and a second chamber, the first chamber including a recess; a ratchet member received in the first chamber and including plural first teeth and at least one tool end; an engaging member placed in the second chamber and including plural second teeth; a direction controlling member inserted into the engaging member to push the engaging member and including a contacting face; a fitting member fixed in the first chamber and including the guiding face so that the guiding face guides the direction controlling member to displace horizontally and including an indent fixed on an outer wall thereof; a C-shaped retainer retained in the indent of the fitting member and the recess of the body to position the fitting member.