Attachment structure for sheet material

An attachment structure for a member and a sheet material to be attached to the member, the attachment structure comprising:

• an attachment hole portion that is provided in the sheet material, and includes a large-diameter hole, a small-diameter hole, and a communication portion, the large-diameter hole and the small-diameter hole communicate with each other through the communication portion;
• a locking portion in the member corresponding to the attachment hole portion, the locking portion is configured to lock with the attachment hole portion to attach the sheet material to the member;
• and
• a projecting piece that is provided in the communication portion and in which a width of the communication portion is narrower than an inner diameter of the small-diameter hole, wherein
• the locking portion includes:
• a column portion that is configured to be inserted into the small-diameter hole;
• a head portion formed at a tip end portion of the column portion, the head portion is configured to be inserted into the large-diameter hole and locked into contact with an opening edge of the small-diameter hole;
• and
• an insertion guide portion having an inclined face formed on a side face of the column portion that is configured to bend the projecting piece in a thickness direction of the sheet material when the column portion comes into contact with the projecting piece and passes through the communication portion.