Modified polyolefin resin composition

A modified polyolefin resin composition, comprising:

• a modified polyolefin resin (X) formed by modifying an acid-modified polyolefin resin (A) with a modification component comprising an alcohol (B), the alcohol (B) comprising ethanol, 1-propanol, and/or 1-butanol,
• wherein the modified polyolefin resin composition satisfies (I) to (III):
• (I) the acid-modified polyolefin resin (A) is a modified polyolefin (a) comprising, in polymerized form, an α,β-unsaturated carboxylic acid anhydride (b) having a structure (b1) comprising a —(C═O)—O—(C═O)— structure;
• (II) a residual ratio of the structure (b1) in the modified polyolefin resin (X) is in a range of from more than 0% to 50% or less;
• and
• (III) the modified polyolefin resin composition comprises the alcohol (B) in a range of from 1.2 to 5.0 mol, relative to 1.0 mol of the structure (b1) in the acid-modified polyolefin resin (A).