A power conversion device comprising: - a power conversion circuit (1, 10, 10A, 10B) which has a switching element (2, 3, 12, 13) and which is configured to perform power conversion of input power through switching operation of the switching element (2, 3, 12, 13) and to output resultant power; and - a control device (20, 20A, 20B, 20C) for controlling the power conversion circuit (1, 10, 10A, 10B), characterised in that the control device (20, 20A, 20B, 20C) includes - a pattern generation unit (21, 21A, 21B, 21C) configured to generate a frequency change pattern (25, 25A, 25B, 25C, 25X) in which 2n switching frequencies f are shifted thereamong, n being an integer equal to or greater than 2, and - a controller (22, 22A, 22B, 22X) configured to generate a control signal for switching the switching element (2, 3, 12, 13), by using the 2n switching frequencies f for respective different duration times in accordance with the generated frequency change pattern (25, 25A, 25B, 25C, 25X), the pattern generation unit (21, 21A, 21B, 21C) includes - a frequency determination unit (23, 23A, 23B) which, using n first frequencies fc and a second frequency fdef smaller than a smallest one of differences among the n first frequencies fc, is configured to determine the 2n switching frequencies f which are generated by adding/subtracting the second frequency fdef to/from each first frequency fc so as to sandwich the first frequency fc, and - a shift determination unit (24, 24A, 24B, 24X) which is configured to determine a shift order of the 2n switching frequencies f so that a middle value between two switching frequencies f before and after shifting does not overlap a value of each switching frequency f, and the controller (22, 22A, 22B, 22X) is configured to use a carrier wave having each switching frequency f as a carrier frequency and to change each carrier frequency in synchronization with upper peaks or lower peaks of the carrier wave. - a power conversion circuit (1, 10, 10A, 10B) which has a switching element (2, 3, 12, 13) and which is configured to perform power conversion of input power through switching operation of the switching element (2, 3, 12, 13) and to output resultant power; and - a control device (20, 20A, 20B, 20C) for controlling the power conversion circuit (1, 10, 10A, 10B), - a pattern generation unit (21, 21A, 21B, 21C) configured to generate a frequency change pattern (25, 25A, 25B, 25C, 25X) in which 2n switching frequencies f are shifted thereamong, n being an integer equal to or greater than 2, and - a controller (22, 22A, 22B, 22X) configured to generate a control signal for switching the switching element (2, 3, 12, 13), by using the 2n switching frequencies f for respective different duration times in accordance with the generated frequency change pattern (25, 25A, 25B, 25C, 25X), the pattern generation unit (21, 21A, 21B, 21C) includes - a frequency determination unit (23, 23A, 23B) which, using n first frequencies fc and a second frequency fdef smaller than a smallest one of differences among the n first frequencies fc, is configured to determine the 2n switching frequencies f which are generated by adding/subtracting the second frequency fdef to/from each first frequency fc so as to sandwich the first frequency fc, and - a shift determination unit (24, 24A, 24B, 24X) which is configured to determine a shift order of the 2n switching frequencies f so that a middle value between two switching frequencies f before and after shifting does not overlap a value of each switching frequency f, and