The present invention provides a metal matrix composite having stable performance without extremely weak portions and capable of assuring strength with a simple structure, the metal matrix composite being formed by hot-pressing or hot-isostatic-pressing a flat formation of reinforcing fibers 10 sandwiched between metal matrices 12 and comprising a joined end part 11 in the longitudinal direction of reinforcing fibers 10 which is joined obliquely at a joining angle of 5 to 60 degrees with respect to the longitudinal direction of reinforcing fibers or more preferably wherein a plurality of metal matrices 11 and a plurality flat formations of reinforcing fibers 10 are lapped each other to form layers of metal matrices and flat formations of reinforcing fibers so that the adjacent upper layers of flat formations of reinforcing fibers and the adjacent lower layers of flat formations of reinforcing fibers to a layer having a joined part of flat formations of reinforcing fibers are continuous and have no joined parts.