A rotary connector apparatus, comprising: a ring-shaped fixed member; a ring-shaped rotating member rotatably fitted to the fixed member; a conductor housed in a housing space formed by the fixed member and the rotating member; a connection connector (50, 50a) having a busbar (70, 70a) connected to an end of the conductor, a connector housing (26, 26a) that houses the connection connector (50, 50a) and connected to the housing space, wherein a connection component that is to be installed into and to be removed from the connection connector (50, 50a) is provided, and wherein the busbar (70, 70a) includes: a connection terminal portion to be connected to another terminal of an external device; a conductor connection portion that is electrically connected to the conductor; and an installation portion into which the connection component that electrically connects the connection terminal portion and the conductor connection portion is removably installed, wherein a through-window through which the connection component can be inserted is formed in a facing portion on an outer side of the connector housing (26, 26a) that faces the installation portion, characterized in that the rotary connector apparatus further comprises a cover member that covers the through-window, and wherein the busbar (70, 70a) further includes a conductivity inspection portion to which a conductivity inspection device is to be connected to test conductivity of the connection component, the conductivity inspection portion being formed further on a side of the conductor connection portion of the busbar (70, 70a) relative to the installation portion. a ring-shaped fixed member; a ring-shaped rotating member rotatably fitted to the fixed member; a conductor housed in a housing space formed by the fixed member and the rotating member; a connection connector (50, 50a) having a busbar (70, 70a) connected to an end of the conductor, a connector housing (26, 26a) that houses the connection connector (50, 50a) and connected to the housing space, wherein a connection component that is to be installed into and to be removed from the connection connector (50, 50a) is provided, and wherein the busbar (70, 70a) includes: a connection terminal portion to be connected to another terminal of an external device; a conductor connection portion that is electrically connected to the conductor; and an installation portion into which the connection component that electrically connects the connection terminal portion and the conductor connection portion is removably installed, a connection terminal portion to be connected to another terminal of an external device; a conductor connection portion that is electrically connected to the conductor; and an installation portion into which the connection component that electrically connects the connection terminal portion and the conductor connection portion is removably installed, wherein a through-window through which the connection component can be inserted is formed in a facing portion on an outer side of the connector housing (26, 26a) that faces the installation portion, characterized in that the rotary connector apparatus further comprises a cover member that covers the through-window, and wherein the busbar (70, 70a) further includes a conductivity inspection portion to which a conductivity inspection device is to be connected to test conductivity of the connection component, the conductivity inspection portion being formed further on a side of the conductor connection portion of the busbar (70, 70a) relative to the installation portion.