A casing (10, 42, 52) of an oven (1, 2, 3, 4), comprising: a base (12, 48, 60) having two first side portions and two second side portions, wherein each of the two first side portions has two first pivot portions; each of the two second side portions has two second pivot portions; two first axes (A1a, A1b) and two second axes (A2a, A2b) are defined, wherein each of the two first axes (A1a, A1b) passes through the two first pivot portions of one of the two first side portions; each of the two second axes (A2a, A2b) passes through the two second pivot portions of one of the two second side portions; two first plates (28, 44, 64) respectively having two first pivot ears, wherein each of the two first pivot ears of each of the two first plates (28, 44, 64) is pivotally connected to one of the two first pivot portions of one of the two first side portions; each of the two first plates (28, 44, 64) is pivotable between a first folded position and a first assembled position relative to the base (12, 48, 60); and two second plates (32, 46, 66) respectively having two second pivot ears, wherein each of the two second pivot ears of each of the two second plates (32, 46, 66) is pivotally connected to one of the two second pivot portions of one of the two second side portions; each of the two second plates (32, 46, 66) is pivotable between a second folded position and a second assembled position relative to the base (12, 48, 60); wherein when each of the two first plates (28, 44, 64) pivots to the first assembled position and each of the two second plates (32, 46, 66) pivots to the second assembled position, the two first plates (28, 44, 64) and the two second plates (32, 46, 66) jointly surround to form a baking space; each of the two first axes (A1a, A1b) and the two second axes (A2a, A2b) are spaced apart from one another in a height direction of the base (12, 48, 60); when each of the two first plates (28, 44, 64) pivots to the first folded position, the two first plates (28, 44, 64) are stacked in the height direction of the base (12, 48, 60); when each of the two second plates (32, 46, 66) pivots to the second folded position, the two second plates (32, 46, 66) are stacked in the height direction of the base (12, 48, 60); the base (12, 48, 60) comprises a substrate; the two first pivot portions are located below the substrate, and the two second pivot portions are located above the substrate; when each of the two first plates (28, 44, 64) pivots to the first folded position, each of the two first plates (28, 44, 64) is lcoated below the substrate; when each of the two second plates (32, 46, 66) pivots to the second folded position, each of the two second plates (32, 46, 66) is located above the substrate. a base (12, 48, 60) having two first side portions and two second side portions, wherein each of the two first side portions has two first pivot portions; each of the two second side portions has two second pivot portions; two first axes (A1a, A1b) and two second axes (A2a, A2b) are defined, wherein each of the two first axes (A1a, A1b) passes through the two first pivot portions of one of the two first side portions; each of the two second axes (A2a, A2b) passes through the two second pivot portions of one of the two second side portions; two first plates (28, 44, 64) respectively having two first pivot ears, wherein each of the two first pivot ears of each of the two first plates (28, 44, 64) is pivotally connected to one of the two first pivot portions of one of the two first side portions; each of the two first plates (28, 44, 64) is pivotable between a first folded position and a first assembled position relative to the base (12, 48, 60); and two second plates (32, 46, 66) respectively having two second pivot ears, wherein each of the two second pivot ears of each of the two second plates (32, 46, 66) is pivotally connected to one of the two second pivot portions of one of the two second side portions; each of the two second plates (32, 46, 66) is pivotable between a second folded position and a second assembled position relative to the base (12, 48, 60); wherein when each of the two first plates (28, 44, 64) pivots to the first assembled position and each of the two second plates (32, 46, 66) pivots to the second assembled position, the two first plates (28, 44, 64) and the two second plates (32, 46, 66) jointly surround to form a baking space; each of the two first axes (A1a, A1b) and the two second axes (A2a, A2b) are spaced apart from one another in a height direction of the base (12, 48, 60); when each of the two first plates (28, 44, 64) pivots to the first folded position, the two first plates (28, 44, 64) are stacked in the height direction of the base (12, 48, 60); when each of the two second plates (32, 46, 66) pivots to the second folded position, the two second plates (32, 46, 66) are stacked in the height direction of the base (12, 48, 60); the base (12, 48, 60) comprises a substrate; the two first pivot portions are located below the substrate, and the two second pivot portions are located above the substrate; when each of the two first plates (28, 44, 64) pivots to the first folded position, each of the two first plates (28, 44, 64) is lcoated below the substrate; when each of the two second plates (32, 46, 66) pivots to the second folded position, each of the two second plates (32, 46, 66) is located above the substrate.