To provide a method for manufacturing a micro-fluid device having a porous part by accurately laminating and fixing a film-like member having a microporous part provided thereto or an extremely thin and flexible film-like member having a porous part to another member in an industrially stable manner.

The method for manufacturing the micro-fluid device having a flow channel and the porous part connected thereto includes a process for coating a coating support with an energy beam curable composition to form a first member comprising a cured or semicured coating film having the porous part, which comprises pores reaching the upper and rear surfaces of the member, provided to at least a part thereof, a process for laminating and fixing the first member to a second member having a deficient part becoming a flow channel reaching the surface thereof so as to superpose the porous part of the first member on the deficient part of the second member and a process for removing the coating support from the first member.