A fixing structure comprising: an object (OB, 6) to be fixed, the object (OB, 6) having a front surface and a back surface; and a pair of support wall portions (10, 310) which are arranged in opposition to the object (OB, 6), at least one of the support wall portions (10, 310) being elastically deformable and being provided with: a support table portion (11, 301) for supporting the back surface of the object to be fixed; a guiding portion which is provided integrally with the support wall portion (10, 310) and protruding from the support wall portion (10, 310), the guiding portion including an inclined surface (120, 312) whose protrusion width from the support wall portion (10, 310) increases with gradual approach to the support table portion (11, 301), and an open end face (124, 314) that is positioned nearer to the support table portion (11, 301) than the inclined surface (120, 312) and faces toward the support table portion; and an abutting portion that is provided integrally with the support wall portion body or the guiding portion so as to protrude in a direction identical to the guiding portion with respect to the support wall portion (10, 310), and is provided with an abutting surface which is inclined in a place where the abutting portion abuts on the object so as to reduce a protrusion width from the support wall portion (10, 310) with gradual approach to the support table portion, characterized in that the abutting surface of the abutting portion is disposed closer to the support table portion (11, 301) than the open end face (124, 314) of the guiding portion, and notch step portions abutting against the abutting surface are formed in an outer edge of the front surface of the object (OB, 6). an object (OB, 6) to be fixed, the object (OB, 6) having a front surface and a back surface; and a pair of support wall portions (10, 310) which are arranged in opposition to the object (OB, 6), at least one of the support wall portions (10, 310) being elastically deformable and being provided with: a support table portion (11, 301) for supporting the back surface of the object to be fixed; a guiding portion which is provided integrally with the support wall portion (10, 310) and protruding from the support wall portion (10, 310), the guiding portion including an inclined surface (120, 312) whose protrusion width from the support wall portion (10, 310) increases with gradual approach to the support table portion (11, 301), and an open end face (124, 314) that is positioned nearer to the support table portion (11, 301) than the inclined surface (120, 312) and faces toward the support table portion; and an abutting portion that is provided integrally with the support wall portion body or the guiding portion so as to protrude in a direction identical to the guiding portion with respect to the support wall portion (10, 310), and is provided with an abutting surface which is inclined in a place where the abutting portion abuts on the object so as to reduce a protrusion width from the support wall portion (10, 310) with gradual approach to the support table portion, characterized in that the abutting surface of the abutting portion is disposed closer to the support table portion (11, 301) than the open end face (124, 314) of the guiding portion, and notch step portions abutting against the abutting surface are formed in an outer edge of the front surface of the object (OB, 6). a support table portion (11, 301) for supporting the back surface of the object to be fixed; a guiding portion which is provided integrally with the support wall portion (10, 310) and protruding from the support wall portion (10, 310), the guiding portion including an inclined surface (120, 312) whose protrusion width from the support wall portion (10, 310) increases with gradual approach to the support table portion (11, 301), and an open end face (124, 314) that is positioned nearer to the support table portion (11, 301) than the inclined surface (120, 312) and faces toward the support table portion; and an abutting portion that is provided integrally with the support wall portion body or the guiding portion so as to protrude in a direction identical to the guiding portion with respect to the support wall portion (10, 310), and is provided with an abutting surface which is inclined in a place where the abutting portion abuts on the object so as to reduce a protrusion width from the support wall portion (10, 310) with gradual approach to the support table portion, characterized in that the abutting surface of the abutting portion is disposed closer to the support table portion (11, 301) than the open end face (124, 314) of the guiding portion, and notch step portions abutting against the abutting surface are formed in an outer edge of the front surface of the object (OB, 6).