A resin composition comprising:
a polymer (1) 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; and
a low-molecular-weight compound (3) 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
a content of the low-molecular-weight compound (3) 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 except the low-molecular-weight compound (3) which is a polymer.