Machining evaluation device, machining system, and machining evaluation method

A machining evaluation device (20a) that evaluates the component shape of a component formed by a mechanical device that machines a workpiece by driving a shaft, the machining evaluation device being provided with: a machining allowance value setting unit (100) that sets a machining allowance value, which is an allowance value for machining errors for each designated site, and a design value, which is a design value for machining errors for each designated site; the designated part is a designated part among parts included in the component after the machining program of the control machining is executed; a machining simulation execution unit (101a) that executes machining simulation of machining using a machine model that simulates the characteristics of the machine device and the machining program (42); and a first machining result evaluation unit (102) that calculates a part machining error (48S), which is a predicted value of the machining error of the simulated shape, for each of the designated parts on t