Disclosed is a header which can prevent a fixing layer for fixing the filtration membrane in the header from being detached from the header and a filtration membrane module comprising the same. A filtration membrane module of the present invention comprises a filtration membrane, a header comprising a case having an opening at an upper part thereof and a partition dividing an inner space of the case into a first space for insertion of the filtration membrane and a second space for fixing the filtration membrane, and a fixing layer. The filtration membrane is potted in the fixing layer which, together with the case, forms a filtrate collecting space in the first space. The partition has a through-hole. The fixing layer exists in at least a portion of the first space, in the second space, and in the through-hole of the partition as well.