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1. A vehicle body frame comprising:
a head pipe; a pair of right and left main frames extending rearward from said head pipe; and a down frame extending downward from said head pipe, wherein said head pipe further includes:
an upper side head pipe provided with an upper side pipe part and a pair of upper and lower facing piece parts extending from the upper side pipe part so as to fit to upper wall portions and lower wall portions of said main frames;a lower side head pipe provided with a lower side pipe part joined to the upper side pipe part and a front side tongue piece part extending from the lower side pipe part so as to fit to a front wall portion of said down frame; anda reinforcing member that is provided with a vertical wall part positioned between the inner side wall portions of said pair of main frames and a rear side tongue piece part extending from the vertical wall part so as to fit to a rear wall portion of said down frame and is joined to a rear portion of the upper side head pipe, wherein the upper side head pipe and the lower side head pipe of the head pipe are formed separately and joined to each other to form the head pipe, wherein, on the reinforcing member, a pair of right and left rear extending parts extending rearward from the vertical wall part along the inner side wall portions of said pair of right and left main frames is provided, wherein the vertical wall part of the reinforcing member is joined to rear end portions of the pair of upper and lower facing piece parts, and wherein, in a side view, a straight line connecting joint areas of the vertical wall part joined to the pair of upper and lower facing piece parts and a straight line connecting rear end portions of the rear extending parts and a rear end portion of the rear side tongue piece part are formed to be substantially parallel to each other.
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