Abstract: A connector structure (CS) includes an adapter (1) to be fitted to an opposing connector (100) that includes opposing terminals (102, 103) in parallel with each other and a connector (2) to be fitted to the adapter (1) in a fitting direction (X1). The connector includes a connector housing (3), a center terminal (4), and an outer terminal (5). The center terminal (4) includes a center terminal portion (40) with a central axis (C1) extending in the fitting direction. The outer terminal (5) includes a cylindrical outer terminal portion (50) that concentrically encloses the center terminal portion (40). The adapter (1) includes an adapter housing (7), a first intermediate contact (8), and a second intermediate contact (9). The adapter housing (7) and the connector housing (3) are rotatable relative to each other about the central axis (C1).

Abstract: A belt used in an electrocardiographic measurement apparatus includes a belt body to be wrapped around a living body, three or more base electrodes disposed in a longitudinal direction of the belt body, and two or more cap electrodes detachable and attachable to the base electrodes and smaller in number than the number of base electrodes.