A catheter assembly is disclosed, which includes a catheter, a catheter hub coupled to the catheter, an inner needle having a needlepoint, a housing coupled to the inner needle, and a protector that covers at least the needlepoint of the inner needle in accordance with evulsion of the inner needle from the catheter. In an initial state, the catheter and the inner needle are exposed from a leading end of the housing, and the catheter hub and the protector are housed in the housing.