In a computer-aided resin behavior analyzer that analyze behavior of a continuous fiber and long discontinuous fiber incorporated in a resin during molding in a mold under predetermined molding conditions through a simulation program installed on a computer, the simulation program is configured to calculate, when analysis conditions including at least multiple nodes F of the fiber is inputted, a bending rate Af of the fiber with respect to an evaluated length obtained from at least one node Fn among multiple nodes F anticipated under the molding conditions based on the analysis conditions, and to evaluate bending of the fiber based on the bending rate Af with respect to the evaluated length.