A metal resin composite comprising: a member made of thermally conductive resin composition; and a member made of metal and including a surface on which fine recesses having a number average inner diameter of 1 to 200 nm are formed by a surface treatment, these members contacting with each other and being joined to each other in such a manner that the thermally conductive resin composition flows into and is fixed to the recesses by injection molding of the thermally conductive resin composition, wherein: the thermally conductive resin composition contains a thermoplastic resin and an inorganic filler; the thermoplastic resin contains a crystalline polyester based resin containing one or more of polybutylene terephthalate, polyethylene terephthalate, and polyester-polyether copolymer; thermal conductivity of the thermally conductive resin composition in a surface direction is 1 W/(m·K) or more; and the inorganic filler is at least one selected from the group consisting of inorganic particles having a thermal conductivity of 2 W/(m·K) or more and a volume average particle diameter of 40 to 700 μm, wherein the inorganic particles comprise flaked graphite; and wherein the content of the inorganic filler is 30 to 60 wt.%, based on the entire thermally conductive resin composition as 100 wt.%. a member made of thermally conductive resin composition; and a member made of metal and including a surface on which fine recesses having a number average inner diameter of 1 to 200 nm are formed by a surface treatment, these members contacting with each other and being joined to each other in such a manner that the thermally conductive resin composition flows into and is fixed to the recesses by injection molding of the thermally conductive resin composition, wherein: the thermally conductive resin composition contains a thermoplastic resin and an inorganic filler; the thermoplastic resin contains a crystalline polyester based resin containing one or more of polybutylene terephthalate, polyethylene terephthalate, and polyester-polyether copolymer; thermal conductivity of the thermally conductive resin composition in a surface direction is 1 W/(m·K) or more; and the inorganic filler is at least one selected from the group consisting of inorganic particles having a thermal conductivity of 2 W/(m·K) or more and a volume average particle diameter of 40 to 700 μm, wherein the inorganic particles comprise flaked graphite; and wherein the content of the inorganic filler is 30 to 60 wt.%, based on the entire thermally conductive resin composition as 100 wt.%. the thermally conductive resin composition contains a thermoplastic resin and an inorganic filler; the thermoplastic resin contains a crystalline polyester based resin containing one or more of polybutylene terephthalate, polyethylene terephthalate, and polyester-polyether copolymer; thermal conductivity of the thermally conductive resin composition in a surface direction is 1 W/(m·K) or more; and the inorganic filler is at least one selected from the group consisting of inorganic particles having a thermal conductivity of 2 W/(m·K) or more and a volume average particle diameter of 40 to 700 μm, wherein the inorganic particles comprise flaked graphite; and wherein the content of the inorganic filler is 30 to 60 wt.%, based on the entire thermally conductive resin composition as 100 wt.%.