A syringe gasket configured to be coupled to a plunger rod of a syringe, and to slide inside a barrel of the syringe by being pushed with the plunger rod, comprising: a first member configured to be inserted into the barrel, and to be in contact with a liquid accommodated in the barrel; and a second member configured to be inserted into the barrel, and to be coupled to the plunger rod, the second member being connected to the first member, wherein the first member includes: a top face configured to be in contact with the liquid; and a first side circumferential face that is continuous with an outer circumferential edge of the top face, and configured to face an inner circumferential face of the barrel, the first side circumferential face has, at an end portion thereof close to the second member, a ring-like trimmed face, and the ring-like trimmed face is recessed to be closer to the inner side in a radial direction than the portion of the first side circumferential face other than the ring-like trimmed face, an inert film is laminated on the top face and the portion of the first side circumferential face other than the ring-like trimmed face, the second member includes: a second side circumferential face configured to face the inner circumferential face of the barrel; and a ring-like protruding portion that extends in a circumferential direction on the second side circumferential face, projects outward in the radial direction from the second side circumferential face, and is configured to be contact with the inner circumferential face of the barrel when the second member is inserted into the barrel, and the ring-like protruding portion at least partially covers the ring-like trimmed face from the outer side in the radial direction. a first member configured to be inserted into the barrel, and to be in contact with a liquid accommodated in the barrel; and a second member configured to be inserted into the barrel, and to be coupled to the plunger rod, the second member being connected to the first member, wherein the first member includes: a top face configured to be in contact with the liquid; and a first side circumferential face that is continuous with an outer circumferential edge of the top face, and configured to face an inner circumferential face of the barrel, a top face configured to be in contact with the liquid; and a first side circumferential face that is continuous with an outer circumferential edge of the top face, and configured to face an inner circumferential face of the barrel, the first side circumferential face has, at an end portion thereof close to the second member, a ring-like trimmed face, and the ring-like trimmed face is recessed to be closer to the inner side in a radial direction than the portion of the first side circumferential face other than the ring-like trimmed face, an inert film is laminated on the top face and the portion of the first side circumferential face other than the ring-like trimmed face, the second member includes: a second side circumferential face configured to face the inner circumferential face of the barrel; and a ring-like protruding portion that extends in a circumferential direction on the second side circumferential face, projects outward in the radial direction from the second side circumferential face, and is configured to be contact with the inner circumferential face of the barrel when the second member is inserted into the barrel, and a second side circumferential face configured to face the inner circumferential face of the barrel; and a ring-like protruding portion that extends in a circumferential direction on the second side circumferential face, projects outward in the radial direction from the second side circumferential face, and is configured to be contact with the inner circumferential face of the barrel when the second member is inserted into the barrel, and the ring-like protruding portion at least partially covers the ring-like trimmed face from the outer side in the radial direction.