A connecting terminal device includes a connecting terminal body having a plurality of pin connection holes. The connecting terminal body has an outer circumferential surface with at least one arcuate groove cut out of the outer circumferential surface. The arcuate groove extends along a circumferential direction centered on a first hole of the plurality of pin connection holes provided in the connecting terminal body. The plurality of pin connection holes other than the first hole are positioned within the arcuate groove. Preferably, the connecting terminal device is part of a compressor.