Access port

An access port to be connected to a catheter, the access port comprising:

• a port body including a liquid storage portion;
• and
• a diaphragm body held by the port body and covering the liquid storage portion, wherein
• the port body includes a connection passage connected to the liquid storage portion to allow the liquid storage portion to communicate with an inside of the catheter, and
• in a cross-section along an axial direction of the connection passage at a connection position where the connection passage is connected to the liquid storage portion, a length in a direction perpendicular to the axial direction between a surface of the diaphragm body opposite to the liquid storage portion and an inner surface of the liquid storage portion gradually decreases as the inner surface proceeds away from the connection position in an inclined region exceeding half of the liquid storage portion along the axial direction;
• a surface of the diaphragm body opposite to the liquid storage portion has a first surface located on a side away from the connection position in the axial direction, and a second surface located on a side closer to the connection position in the axial direction with respect to the first surface and inclined with respect to the first surface, wherein the first surface and the second surface intersect on a bent portion which extends linearly along a second direction perpendicular to the axial direction to create an angle therebetween;
• a length of the first surface along the axial direction is longer than a length of the second surface along the axial direction,
• the first surface is inclined with respect to the axial direction toward a side away from the inner surface of the liquid storage portion as the first surface approaches the connection position in the axial direction, and
• an inclination angle of the first surface with respect to the axial direction is larger than an inclination angle of the second surface with respect to the axial direction.