A front portion structure of a vehicle body cover for a motorcycle, comprising: a leg shield which covers, from the rear, a head pipe provided at a front end portion of a vehicle body frame in front of legs of an occupant seated on a riding seat; and front side covers provided continuously to opposite left and right sides of the leg shield so as to cover the head pipe from the left and right sides; the leg shield having openings (60, 64) provided therein; wherein an accommodation case is accommodated in one of the openings (60, 64) so as to project forwardly; characterised by: each of the front side covers having an extension integrally provided thereon in such a manner as to extend to a rear face of the leg shield and surround at least part of the openings (60, 64) and overlap with the rear face of the leg shield around the openings (60, 64); wherein a flange portion provided integrally at a rear portion of the accommodation case and extending sidewardly outwards is attached to the leg shield around the one opening while the extension is formed so as to surround the flange portion from an outer side; and wherein a curved portion which curves forwardly when viewed in side elevation is formed at each of portions of the leg shield and the front side covers corresponding to the openings (60, 64), and lids (66, 70) for openably closing the openings (60, 64) are attached to the leg shield. a leg shield which covers, from the rear, a head pipe provided at a front end portion of a vehicle body frame in front of legs of an occupant seated on a riding seat; and front side covers provided continuously to opposite left and right sides of the leg shield so as to cover the head pipe from the left and right sides; the leg shield having openings (60, 64) provided therein; wherein an accommodation case is accommodated in one of the openings (60, 64) so as to project forwardly; characterised by: each of the front side covers having an extension integrally provided thereon in such a manner as to extend to a rear face of the leg shield and surround at least part of the openings (60, 64) and overlap with the rear face of the leg shield around the openings (60, 64); wherein a flange portion provided integrally at a rear portion of the accommodation case and extending sidewardly outwards is attached to the leg shield around the one opening while the extension is formed so as to surround the flange portion from an outer side; and wherein a curved portion which curves forwardly when viewed in side elevation is formed at each of portions of the leg shield and the front side covers corresponding to the openings (60, 64), and lids (66, 70) for openably closing the openings (60, 64) are attached to the leg shield. each of the front side covers having an extension integrally provided thereon in such a manner as to extend to a rear face of the leg shield and surround at least part of the openings (60, 64) and overlap with the rear face of the leg shield around the openings (60, 64); wherein a flange portion provided integrally at a rear portion of the accommodation case and extending sidewardly outwards is attached to the leg shield around the one opening while the extension is formed so as to surround the flange portion from an outer side; and wherein a curved portion which curves forwardly when viewed in side elevation is formed at each of portions of the leg shield and the front side covers corresponding to the openings (60, 64), and lids (66, 70) for openably closing the openings (60, 64) are attached to the leg shield.