A catheter assembly (10) includes: a hollow catheter (12)； a catheter hub (14) adapted to fix and hold the catheter (12)； an inner needle (16) having a needlepoint (16a) and detachably inserted into the catheter (12)； and a needle hub (18) adapted to fix and hold the inner needle (16). Additionally, the catheter assembly (10) includes a catheter operation member (20) capable of moving the catheter (12) relative to the inner needle (16). The catheter operation member (20) includes a holding portion (58) adapted to directly hold the catheter (12) in a detachable manner.
