To provide an org. and inorg. composite having excellent mechanical characteristics, and its manufacturing method.

Particles 1 composed of an inorg. porous material having many small pores 10 are dispersed in an org. compd. 2. The mean pore diameter of the small pores is 0.3-10nm. The small pores are filled with an org. compd. Eighty % of the total small pores preferably have a pore diameter of less than two times the mean pore diameter. In manufacturing the org. and inorg. composite 3, the inorg. porous material is mixed with the melted org. compd. and a pressure is applied on the mixture.