Patent ID: 7762587

Claim:
A body frame structure of a straddle-type four wheeled vehicle, comprising: a pair of right and left upper frame members, each of said upper frame members having a connecting portion at a rear end thereof; a pair of right and left lower frame members; a front frame member connecting a front end of said upper frame members to a front end of said lower frame members; and a pair of right and left bracket members connecting rear ends of said upper frame members and rear ends of said lower frame members, each of said bracket members having an open connecting portion at an upper end thereof, said connecting portion of each of said upper frame members being inserted into said open connecting portion of a respective one of said bracket members; wherein said upper frame members, said lower frame members, said front frame member and said bracket members are made of aluminum or an alloy including aluminum; and wherein an edge of said open connecting portion of each of said bracket members being shaped on a bias with respect to a plane perpendicular to an inserting direction of said connecting portion of each of said upper frame members, said edge being shaped such that an outside wall portion of said open connecting portion of each of said bracket members with respect to a width-wise direction of the vehicle extends further forward than an inside wall portion of said open connecting portion of said each of said bracket members in plan view.