Hollow fiber membrane module and hollow fiber membrane for module

A hollow fiber membrane module comprising:

• a hollow fiber membrane bundle that has a plurality of hollow fiber membranes aligned in one direction;
• a housing that accommodates the hollow fiber membrane bundle;
• and
• a potting portion provided around both ends or one end of the hollow fiber membrane bundle, in which space between an outer surface of the hollow fiber membranes and an inner surface of the housing is filled with a potting agent, wherein
• each of the hollow fiber membranes has a body portion, and an enlarged-diameter portion provided at both ends or one end of the body portion and having an inner diameter enlarged as compared to the body portion, and a tapered portion provided between the body portion and the enlarged-diameter portion and having an inner diameter enlarged gradually in a direction from the body portion toward the enlarged-diameter portion,
• neither the body portion nor the enlarged-diameter portion has a tapered shape,
• the enlarged-diameter portion is buried in the potting portion, and
• in a longitudinal direction of the hollow fiber membrane, the body portion is longer than the enlarged-diameter portion and the enlarged-diameter portion is longer than the tapered portion.