Machining program conversion device, numerical control device, and machining program conversion method

A machining program conversion device (100) is characterized by being provided with: a numerical control simulation unit (106) that generates numerical control processing results by simulating, on the basis of a machining program, numerical control processing of a numerical control machine tool controlled by the machining program; a correction site detection unit (107) that detects the correction site on the basis of a correction condition, which is a condition for determining the presence or absence of the correction site in the machining program, and the numerical control processing result; a correction section determination unit (109) that determines, as a correction section, a plurality of consecutive blocks including the correction site; a cutting point calculation unit (108) that finds, on the basis of the machining program, the machining target shape, and the tool information, a cutting point of the tool with respect to the machining target shape in a movement command of the machining program; and a ma