To provide an air conditioning load calculation device which calculates a comfortable air conditioning load matched to the actual state.

This air conditioning load calculation device comprises: an input part 12 for inputting various pieces of information including how-to-use information for air conditioning; a storage part 13 for storing information for building elements, Q-value approximate line information and μ-value approximate line information; a thermal loss coefficient calculation means for calculating a thermal loss coefficient from the information for building elements satisfied by an independent building; an air conditioning load calculation part 11 for calculating an air conditioning load based on the calculated thermal loss coefficient, the Q-value approximate line information, the μ-value approximate line information and the how-to-use information for air conditioning; and an output part 14 for outputting the calculated air conditioning load.