The hollow fiber membrane module pertaining to the present invention is provided with: a cylindrical container (2) in which one end part and the other end part thereof are open； a hollow fiber membrane bundle (3) loaded in the cylindrical container (2)； a potting part (4) in which the hollow fiber membrane bundle (3) is embedded and fixed in both end parts of the cylindrical container (2)； and a header (5) having a nozzle as a fluid exit/entrance, the header (5) being provided to both end parts of the cylindrical container (2). In the hollow fiber membrane module, the header (5) and the cylindrical container (2) are welded in at least the two locations of a primary weld part (71) and a secondary weld part (72), the secondary weld part (72) being disposed in a position at which welding is initiated after or at the same time as the start of welding of the primary weld part (71).本發明之中空絲膜模組係如下之中空絲膜模組，其具備：筒狀容器(2)，其一端部及另一端部開口；中空絲膜之束(3)，其裝填於該筒狀容器(2)內；灌封部(4)，其將中空絲膜之束(3)於筒狀容器(2)之兩端部包埋固定；及集管(5)，其設置於筒狀容器(2)之兩端部，且具有成為流體之出入口之噴嘴。於該中空絲膜模組中，集管(5)與筒狀容器(2)係至少於1次熔接部(71)及2次熔接部(72)之2部位之區域熔接，2次熔接部(72)係配置於在1次熔接部(71)之熔接開始後或與熔接開始同時地開始熔接之位置。
