An object of the present invention provides a resin composition which does not deteriorate transparency and exhibits excellent heat retaining properties when it is used as an agricultural film and an agricultural film.The resin composition comprises 100 parts by weight of a resin and 1 to 20 parts by weight of a lagging agent, wherein the lagging agent is represented by the following formula (1) and has a difference between the molar ratio obtained from 2θ of the (110) plane by an X-ray diffraction method and the molar ratio obtained by chemical analysis of 0.7 or less (the molar ratio is a Mg/Al2 value)MgXAl2(OH)2X+4(CO3)‧ mH2O (1) (in the formula, 4.0
