Composite structure and manufacturing method therefor

A method for producing a composite structure in which a surface-roughened metal member is joined to a resin member made of a molded article formed by melting and molding a polyarylene sulfide resin composition containing a polyarylene sulfide resin, the method comprising:

• a step (α) of melting and molding the polyarylene sulfide resin composition on a surface of a metal member to perform joining or a step (β) of joining the surface of the metal member and the molded article,
• wherein a number average value (Sdr0) of developed area ratios (Sdr) of an interface measured at five random points in the surface-roughened metal member using a confocal microscope based on ISO 25178 is 5% or more,
• a maximum height roughness (Rz) of four random straight line points on a surface of the surface-roughened metal member using a stylus-type roughness meter based on ISO 4287 is 2 μm or more and 30 μm or less,
• an average length (RSm) of four random straight line points on a surface of the surface-roughened metal member using a stylus-type roughness meter based on ISO 4287 is 10 μm or more and less than 100 μm, and
• a melt viscosity of the polyarylene sulfide resin, measured using a capillary type flow tester after holding the polyarylene sulfide resin at 300° C. for six minutes with a load of 1.96×106 Pa and L/D=10 (mm)/1 (mm), is 15 Pa·s or more and 500 Pa·s or less.