Modified polyolefin resin and use thereof

A modified polyolefin resin, wherein the modified polyolefin resin is a graft-modified product grafted body in which a component (A) that is a polyolefin resin having an ethylene structural unit content of 50% or more by mole is modified with a component (B) that is an α,β-unsaturated carboxylic acid or an anhydride thereof and a component (C) that is a (meth)acrylate ester represented by a general formula (I):

• CH2=C(R1)COOR2 (I)
• where in the general formula (I), R1 represents a hydrogen atom or a methyl group, and R2 represents a hydrocarbon group represented by CnH2n+1, where n represents an integer of 8 to 18;
• an extrapolated melting end temperature (Tem) of the modified polyolefin resin measured in accordance with JIS K7121-1987 using a differential scanning calorimeter at a temperature raising rate of 10° C./minute is 58° C. or lower;
• and
• a melting point of the polyolefin resin having an ethylene structural unit content of 50% or more by mole measured in accordance with JIS K7121-1987 using a differential scanning calorimeter at a temperature raising rate of 10° C./minute is 35° C. or lower.