COATING METHOD OF AUTOMOBILE BODY

A coating method of an automobile body for forming a multilayer coating film on an electrodeposition coating film layer of an outer plate part, an inner plate part and a boundary part between the inner plate part and the outer plate part of an automobile body is disclosed, which comprises coating an outer plate part of an automobile body by a 4-coat 1-bake system including coating a white based intermediate paint (1) with from N7 to N9.5 on an electrodeposition coating film layer, coating a white based color base paint (2) with from N7 to N9.5 thereon by a wet-on-wet technique, coating a luster material-containing base paint (3) containing a luster pigment thereon by a wet-on-wet technique, further coating a clear paint (4) thereon by a wet-on-wet technique, and then baking for hardening a first multilayer coating film in the outer plate part of the automobile body; and carrying out at least one step of steps (A) and (B) and thereafter carrying out a step (C) with respect to an inner plate part and a boundary part of the automobile body, the step (A) including coating the white based intermediate paint (1) in the inner plate part and the boundary part of the automobile body, prior to coating the white based intermediate paint (1) in the outer plate part of the automobile body, the step (B) including coating the white based color base paint (2) in the inner plate part and the boundary part of the automobile body, prior to coating the white based color base paint (2) in the outer plate part of the automobile body, and the step (C) including coating a luster material-containing clear paint (5) corresponding to a paint containing the luster pigment dispersed in the clear paint (4) in the inner plate part and the boundary part of the automobile body, prior to coating the clear paint (4) in the outer plate part of the automobile body; wherein a second multilayer coating film in the inner plate part and the boundary part of the automobile body is baked simultaneously with baking of the first multilayer coating film in the outer part of the automobile body.