An electrical connecting device provided between a steering wheel and a steering column to establish an electric connection therebetween. The connecting device comprises a stationary body fixedly secured to the steering column, a rotatable body provided rotatably and placed to define a circular space with respect to the stationary body, a flexible flat cable located in the circular space, one end of which is fixedly secured to the rotatable body and the other end of which is fixedly secured to the stationary body so that the flat cable makes an electrical communication between the rotatable body and the stationary body, and a semi-fluid material adhered to a bottom surface of the stationary body which stands in opposed relation to both ends of the flat cable in its width direction. The flat cable is made to move to follow rotations of the rotatable body in forward or reverse direction. A groove-like pool section is made in the semi-fluid material adhered inner surface in radial direction of the rotatable body. This pool section accommodates the semi-fluid material to satisfy the requirements for improvement of controllability of a steering wheel and suppression of occurrence of noises.