Composition for a glass fiber-reinforced polyolefin resin material, glass fiber-reinforced polyolefin resin material and its production method, and composite

A glass fiber-reinforced polyolefin resin material, comprising:

• a glass fiber;
• and a thermoplastic resin,
• wherein said thermoplastic resin comprises:
• at least, a graft-modified polypropylene modified with a (meth)acrylate containing an epoxy group or a graft-modified polypropylene modified with both a (meth)acrylate containing an epoxy group and an aromatic vinyl compound,
• wherein, with respect to 100 parts by mass of the graft-modified polypropylene, from 30 to 80 parts by mass of the glass fiber and from 1 to 20 parts by mass of a compound or polymer having an acid anhydride structure are contained, and
• wherein, in the content of a graft-modification component in the graft-modified polypropylene, the content of a component obtained from the (meth)acrylate containing an epoxy group is 0.5 or more and 10 or less parts by mass with respect to 100 parts by mass of said polypropylene, and a component obtained from the aromatic vinyl compound has a mass equal to or less than said component obtained from the (meth)acrylate.