A resin composition comprising: a polymer whose enthalpy of fusion (ΔH) observed within a temperature range of 10°C or higher and lower than 60°C in differential scanning calorimetry is 30 J/g or more; a low-molecular-weight compound whose enthalpy of fusion (ΔH) observed within a temperature range of 0°C or higher and lower than 100°C in differential scanning calorimetry is 30 J/g or more and whose molecular weight is 2000 or lower, wherein the low-molecular can include also a compound having one or more repeating units in the molecule as long as the molecular weight is 2000 or lower; and a polymer whose melting peak temperature or glass transition temperature observed in differential scanning calorimetry is 50°C or higher and 180°C or lower, provided that the polymer is different from the polymer, wherein a content of the polymer is 30 wt% or more and 99 wt% or less and a content of the polymer is 1 wt% or more and 70 wt% or less, with respect to 100 wt% of the total amount of the polymer and the polymer, a content of the low-molecular-weight compound is 3 parts by weight or more and 1000 parts by weight or less, with respect to 100 parts by weight of the total amount of polymer components contained in the resin composition, wherein the polymer components in the resin composition do not include the low molecular weight compound when this is a compound having a polymer structure, which corresponds to a compound having two or more repeating units in the molecule, and the polymer is a polymer comprising a constitutional unit derived from ethylene and a constitutional unit represented by the following formula: wherein R represents a hydrogen atom or a methyl group; L 1 represents -CO-O-, -O-CO-, or -O-; L 2 represents a single bond, -CH 2 -, -CH 2 -CH 2 -, -CH 2 -CH 2 -CH 2 -, -CH 2 -CH -CH 2 -, or - CH 2 -CH(CH 2 OH)-; L 3 represents a single bond, -CO-O-, -O-CO-, -O-, -CO-NH-, -NH-CO-, -CO-NH-CO-, -NH-CO-NH-, -NH-, or -N(CH 3)-; L 6 represents an alkyl group having 14 or more and 30 or less carbons; and a left side and a right side of each of the horizontal chemical formulas for describing chemical structures of L 1, L 2, and L 3 correspond to an upper side of the formula and a lower side of the formula, respectively. a polymer whose enthalpy of fusion (ΔH) observed within a temperature range of 10°C or higher and lower than 60°C in differential scanning calorimetry is 30 J/g or more; a low-molecular-weight compound whose enthalpy of fusion (ΔH) observed within a temperature range of 0°C or higher and lower than 100°C in differential scanning calorimetry is 30 J/g or more and whose molecular weight is 2000 or lower, wherein the low-molecular can include also a compound having one or more repeating units in the molecule as long as the molecular weight is 2000 or lower; and a polymer whose melting peak temperature or glass transition temperature observed in differential scanning calorimetry is 50°C or higher and 180°C or lower, provided that the polymer is different from the polymer, wherein a content of the polymer is 30 wt% or more and 99 wt% or less and a content of the polymer is 1 wt% or more and 70 wt% or less, with respect to 100 wt% of the total amount of the polymer and the polymer, a content of the low-molecular-weight compound is 3 parts by weight or more and 1000 parts by weight or less, with respect to 100 parts by weight of the total amount of polymer components contained in the resin composition, wherein the polymer components in the resin composition do not include the low molecular weight compound when this is a compound having a polymer structure, which corresponds to a compound having two or more repeating units in the molecule, and the polymer is a polymer comprising a constitutional unit derived from ethylene and a constitutional unit represented by the following formula: wherein R represents a hydrogen atom or a methyl group; L 1 represents -CO-O-, -O-CO-, or -O-; L 2 represents a single bond, -CH 2 -, -CH 2 -CH 2 -, -CH 2 -CH 2 -CH 2 -, -CH 2 -CH -CH 2 -, or - CH 2 -CH(CH 2 OH)-; L 3 represents a single bond, -CO-O-, -O-CO-, -O-, -CO-NH-, -NH-CO-, -CO-NH-CO-, -NH-CO-NH-, -NH-, or -N(CH 3)-; L 6 represents an alkyl group having 14 or more and 30 or less carbons; and a left side and a right side of each of the horizontal chemical formulas for describing chemical structures of L 1, L 2, and L 3 correspond to an upper side of the formula and a lower side of the formula, respectively. R represents a hydrogen atom or a methyl group; L 1 represents -CO-O-, -O-CO-, or -O-; L 2 represents a single bond, -CH 2 -, -CH 2 -CH 2 -, -CH 2 -CH 2 -CH 2 -, -CH 2 -CH -CH 2 -, or - CH 2 -CH(CH 2 OH)-; L 3 represents a single bond, -CO-O-, -O-CO-, -O-, -CO-NH-, -NH-CO-, -CO-NH-CO-, -NH-CO-NH-, -NH-, or -N(CH 3)-; L 6 represents an alkyl group having 14 or more and 30 or less carbons; and a left side and a right side of each of the horizontal chemical formulas for describing chemical structures of L 1, L 2, and L 3 correspond to an upper side of the formula and a lower side of the formula, respectively.