A hollow fiber membrane module 1 includes: a tubular container 2 accommodating a hollow fiber membrane bundle 3； headers 5, and potted parts 4. The header 5 includes a header protrusion 22 that protrudes in an annular shape toward the tubular container 2. The tubular container 2 includes double annular protrusions, which are an inner protrusion 50 and an outer protrusion 51 protruding toward the header 5. The header 5 and the tubular container 2 are welded together by ultrasonic welding, with the header protrusion 22 being inserted between the inner protrusion 50 and the outer protrusion 51 of the tubular container 2. The header protrusion 22 and the inner protrusion 50 of the tubular container 2 are welded together at least in one or more regions, and the header protrusion 22 and the outer protrusion 51 of the tubular container 2 are welded together at least in one or more regions.
