To provide structure for attaching the sheet material to a structural frame with which labor for dividing the part of the sheet material to be locked to the lock part of the structural frame having a curvature and labor for attaching the plural divided parts to be locked at the prescribed positions of the sheet material can be saved and the generation of creases on the sheet material caused by the attachment of plural divided parts to be locked at intervals onto the sheet material can be prevented as well.

A lock part 2a is formed on a structural frame 2 of the vehicle while being extended along with the structural frame 2. A part 5 to be locked with the lock part 2a is provided at an edge part 3a of the sheet material 3. The part 5 to be locked is formed so as to be bent by alternately arranging a soft section 5a to be freely bent and a hard section 5b having tensile strength higher than that of soft section 5a toward the lengthwise direction of part 5a to be locked. While locking the part 5 to be locked with the lock part 2a, the sheet material 3 is attached to the bone member 2.