Abstract: An inner box for a cooker is provided including a front plate having an opening portion and an inner box main body bonded to a peripheral edge of the opening portion comprising a first fold-to-bend portion constituted by folding to bend an end portion thereof to invert to be brought into close contact therewith and a second fold-to-bend portion constituted by inverting a portion on a side of the end portion of the first fold-to-bend portion with a predetermined clearance therebetween and a flange portion inserted into the clearance between the first fold-to-bend portion and the second fold-to-bend portion, and wherein the bonding portions of the front plate and the inner box main body are constituted by a structure of inserting the flange portion into the clearance to be calked to bond therewith.

Abstract: An inner box for a cooker including a front plate 13 having an opening portion 11 and an inner box main body 23 bonded to a peripheral edge of the opening portion 11 for cooking by irradiating a high frequency wave into the inner box main body 23, wherein at least either one of bonding portions 28 of the front plate 13 and the inner box main body 23 is formed with a first fold-to-bend portion 25 constituted by folding to bend an end portion thereof to invert to be brought into close contact there with and a second fold-to-bend portion 27 constituted by inverting a portion on a side of the end portion of the first fold-to-bend portion 25 with a predetermined clearance there between, other of the bonding portions 28 of the front plate 13 and the inner box main body 23 is formed with a flange portion 33 inserted into the clearance between the first fold-to-bend portion 25 and the second fold-to-bend portion 27 and the bonding portions of the front plate 13 and the inner box main body 23 are constituted by a stru