A rotatable connector device includes a fixed-side member which is to be fixed, and a rotatable-side member which is relatively rotatably attached to the fixed-side member. The rotatable-side member receives a rotation input. The rotatable connector device have a fixed-side cable end accommodation section, projecting from an outer circumferential surface of the fixed-side member in a tangential direction thereof, for accommodating and holding a terminal conductor connection section provided at an end of a flat cable accommodated in the rotatable connector device. The flat cable has a bent portion, in a portion thereof on a side of the terminal conductor connection section, for bending the flat cable so as to shift the portion on the side of the terminal conductor connection section in a width direction of the flat cable.