To provide a technology for clarifying the relation between an occupant deceleration at the head-on collision and a ride-down effect, and simulating what kind of car body front part rigidity is required for occupant protection based on the ride-down effect.

This simulation apparatus comprises a car body front part characteristic setting part 21 for setting a buckling characteristic of the car body front part at the collision in a dynamic model as a nonlinear spring; a seat belt characteristic setting part 22 for setting a seat belt as a linear spring or a nonlinear spring; an occupant deceleration operation part 31 for operating the occupant deceleration, while changing the characteristic of the nonlinear spring showing the buckling characteristic of the car body front part as a parameter; a ride-down effect index value operation part 32 for operating a ride-down effect index value; and an output part 40 for outputting set pointer information of the car body front part rigidity based on the ride-down effect from the minimum value of the occupant deceleration.