Composite structure and manufacturing method thereof

A method for producing a composite structure in which a metal member having a roughened surface and a resin member are joined in a state in which at least a portion of the roughened surface is included, the resin member being made of a molded article obtained by melt-molding a polyarylene sulfide resin composition containing a polyarylene sulfide resin, the method comprising:

• a step (α) of joining by melt-molding the polyarylene sulfide resin composition on a surface of the metal member, or a step (β) of joining the surface of the metal member and the molded article, wherein
• in the roughened surface, a cumulative pore volume of a pore diameter in a range of 0.1 μm to 20 μm is in a range of 0.5 nL/mm2 or more and 5 nL/mm2 or less measured by mercury porosimetry,
• the roughened surface has a pore diameter of 5 μm or less in which a pore distribution shows a maximum value in the pore diameter in the range of 0.1 μm to 20 μm measured by the mercury porosimetry, and
• the polyarylene sulfide resin has a melt viscosity in a range of 5 Pa·s or more and 500 Pa's or less, wherein the melt is viscosity measured using a Koka flow tester after being held at 300° C., a load of 1.96×106 Pa, and L/D=10 (mm)/1 (mm) for 6 minutes.