An oxygen measurement device (10A) includes a urethral catheter (18a), and an oxygen sensor (20a) including an oxygen sensor main body (50a) capable of detecting oxygen in urine. In a shaft (22a), a urine introduction port (28a) allowing the urine in a bladder (140) to flow therein, and a urinary passage (74) communicated with the urine introduction port (28a) to circulate the urine, are disposed, and the oxygen sensor (20a) is disposed in the urethral catheter (18a) such that the oxygen sensor main body (50a) is in contact with the urine circulated in the urinary passage (74).
