PROBLEM TO BE SOLVED: To provide a method for inspecting a dialyzer in a hemodialysis apparatus and a hemodialysis apparatus, with which leakage from a filtration membrane in a dialyzer is detected while preventing the damage of a blood circuit or the filtration membrane.SOLUTION: The hemodialysis apparatus includes the dialyzer in which a dialysis fluid circuit for circulating a dialysis fluid and the blood circuit for circulating blood are connected to each other, and a pressure measuring unit for measuring the pressure in the dialysis fluid circuit. While the fluid is held in the dialysis fluid circuit and the blood circuit is opened to the atmosphere, the fluid in the dialysis fluid circuit is discharged to reduce the internal pressure of the dialysis fluid circuit to a negative pressure, and the pressure of the dialysis fluid circuit is measured by the pressure measuring unit. When the pressure in the dialysis fluid circuit does not have a variation, it is determined that the filtration membrane of the dialyzer does not have an abnormal condition, and when the pressure in the dialysis fluid circuit has a variation, it is determined that the filtration membrane of the dialyzer has leakage.
