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 (S) formed by the fixed member and the rotating member ; a connection connector having a busbar connected to an end of the conductor , a connector housing that houses the connection connector and connected to the housing space (S), wherein a connection component that is to be installed into and to be removed from the connection connector is provided, and wherein the busbar 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 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 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 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 (S) formed by the fixed member and the rotating member ; a connection connector having a busbar connected to an end of the conductor , a connector housing that houses the connection connector and connected to the housing space (S), wherein a connection component that is to be installed into and to be removed from the connection connector is provided, and wherein the busbar 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 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 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 relative to the installation portion . <EOS>