The flexible substrate module

Object of the present invention is to provide a flexible substrate module, which uses a flexible substrate, and a very good heat dissipation properties of the heat source is mounted, and flexibility, the integration is also very good. The flexible substrate module (1), as a surface layer on the surface side of the flexible insulating base material (11) laminated to form a printed wiring layer (12), and equipped with a heat source (14 on the printed wiring layer (12) ), surface contact mounted on the housing as a mounting object K, wherein the back surface layer as a heat insulating the flexible base material (11) laminated on the back side, which is made of a multilayer laminate highly thermally conductive material promoting the diffusion layer (21, 23), for facilitating the heat source from (14) (12) toward the hot heat transfer area of ​​the printed wiring layer is enlarged as the object of mounting frame K.