To provide a filtration equipment which enables preventing air lock and performing stable filtration and diffusion of filtrate.

Object liquid to be filtered is flown into a first hollow fiber membrane module 2 which is of an external pressure filtration type (the arrow P0) and is subjected to filtration by means of the first hollow fiber membrane module 2, and the filtrate is further passed through a connection pipe 4 (the arrow P1), is subjected to filtration by means of a second hollow fiber membrane module 3 which is of an internal pressure filtration type and is diffused to the outside of the equipment (the arrow P2).