An electric position adjustment apparatus fora steering wheel, comprising: a steering shaft (2a, 2b), with a steering wheel being supported by and fastened to a rear-end section thereof; and a column unit that comprises: a support section (31, 6c) that extends in an axial direction of the steering shaft (2a, 2b), supports the steering shaft (2a, 2b) on an inside thereof so as to be able to freely rotate, is supported by a portion that is fastened to a vehicle body or a vehicle body side bracket that is supported by a portion that is fastened to the vehicle body and does not displace during position adjustment of the steering wheel; and an adjusted section (5b, 7c) that is supported by the support section (31, 6c) so as to be able to displace in the axial direction of the steering shaft (2a, 2b) with at least part of the steering shaft (2a, 2b) during position adjustment of the steering wheel; characterized in that the electric position adjustment apparatus further comprises: a moving piece (16a, 16b) that comprises a concave engaging section (19a, 19b), and is able to displace in an axial direction of the column unit with an electric motor (56, 15a) as a driving source; and a transmission member that comprises a base-end section that is connected to and fastened to the adjusted section (5b, 7c), and a tip-end section that engages with the concave engaging section (19a, 19b) of the moving piece (16a, 16b) by way of a spac er, and that is able to transmit movement of the moving piece (16a, 16b) to the adjusted section (5b, 7c), and wherein the concave engaging section (19a, 19b) of the moving piece (16a, 16b) has a cylindrical concave-shaped inner-circumferential surface whose innerdiameterdoes not change in an axial direction of the transmission member; the tip-end section of the transmission member has a cylindrical convex-shaped outer-circumferential surface whose outer diameter does not change in the axial direction of the transmission member; the spacer has a cylindrical convex-shaped outer-circumferential surface whose outer diameter does not change in the axial direction of the transmission member and has a cylindricalconcave-shaped inner-circumferential surface whose inner diameter does not change in the axial direction of the transmission member. a steering shaft (2a, 2b), with a steering wheel being supported by and fastened to a rear-end section thereof; and a column unit that comprises: a support section (31, 6c) that extends in an axial direction of the steering shaft (2a, 2b), supports the steering shaft (2a, 2b) on an inside thereof so as to be able to freely rotate, is supported by a portion that is fastened to a vehicle body or a vehicle body side bracket that is supported by a portion that is fastened to the vehicle body and does not displace during position adjustment of the steering wheel; and an adjusted section (5b, 7c) that is supported by the support section (31, 6c) so as to be able to displace in the axial direction of the steering shaft (2a, 2b) with at least part of the steering shaft (2a, 2b) during position adjustment of the steering wheel; characterized in that the electric position adjustment apparatus further comprises: a moving piece (16a, 16b) that comprises a concave engaging section (19a, 19b), and is able to displace in an axial direction of the column unit with an electric motor (56, 15a) as a driving source; and a transmission member that comprises a base-end section that is connected to and fastened to the adjusted section (5b, 7c), and a tip-end section that engages with the concave engaging section (19a, 19b) of the moving piece (16a, 16b) by way of a spac er, and that is able to transmit movement of the moving piece (16a, 16b) to the adjusted section (5b, 7c), and a moving piece (16a, 16b) that comprises a concave engaging section (19a, 19b), and is able to displace in an axial direction of the column unit with an electric motor (56, 15a) as a driving source; and a transmission member that comprises a base-end section that is connected to and fastened to the adjusted section (5b, 7c), and a tip-end section that engages with the concave engaging section (19a, 19b) of the moving piece (16a, 16b) by way of a spac er, and that is able to transmit movement of the moving piece (16a, 16b) to the adjusted section (5b, 7c), and wherein the concave engaging section (19a, 19b) of the moving piece (16a, 16b) has a cylindrical concave-shaped inner-circumferential surface whose innerdiameterdoes not change in an axial direction of the transmission member; the tip-end section of the transmission member has a cylindrical convex-shaped outer-circumferential surface whose outer diameter does not change in the axial direction of the transmission member; the spacer has a cylindrical convex-shaped outer-circumferential surface whose outer diameter does not change in the axial direction of the transmission member and has a cylindricalconcave-shaped inner-circumferential surface whose inner diameter does not change in the axial direction of the transmission member.