A scroll compressor comprising: a casing having a cylindrical shape; a compression mechanism housed in the casing and including a fixed scroll, a movable scroll, and a housing; and a drive shaft configured to rotate the movable scroll, wherein the housing includes: a bearing portion configured to rotatably support the drive shaft; a body portion continuous with the bearing portion and extending radially outward; a pressing portion provided radially outside the body portion to press the casing; a supporting portion extending from a face of the body portion near the fixed scroll in an axial direction toward the fixed scroll; and a weld portion welded to the casing, an end face of the supporting portion near the fixed scroll is a fastening face to which the fixed scroll is fastened, a gap is formed between an inner peripheral surface of the casing and outer peripheral surfaces of the body portion and the supporting portion, an axial length of the gap is greater than or equal to an axial length from the end face of the supporting portion near the fixed scroll to the face of the body portion near the fixed scroll, at least part of the pressing portion and at least part of the weld portion are arranged side by side in a circumferential direction of the casing, and the weld portion communicates with an internal space of the casing through the gap. a casing having a cylindrical shape; a compression mechanism housed in the casing and including a fixed scroll, a movable scroll, and a housing; and a drive shaft configured to rotate the movable scroll, wherein the housing includes: a bearing portion configured to rotatably support the drive shaft; a body portion continuous with the bearing portion and extending radially outward; a pressing portion provided radially outside the body portion to press the casing; a supporting portion extending from a face of the body portion near the fixed scroll in an axial direction toward the fixed scroll; and a weld portion welded to the casing, an end face of the supporting portion near the fixed scroll is a fastening face to which the fixed scroll is fastened, a gap is formed between an inner peripheral surface of the casing and outer peripheral surfaces of the body portion and the supporting portion, an axial length of the gap is greater than or equal to an axial length from the end face of the supporting portion near the fixed scroll to the face of the body portion near the fixed scroll, at least part of the pressing portion and at least part of the weld portion are arranged side by side in a circumferential direction of the casing, and the weld portion communicates with an internal space of the casing through the gap. a bearing portion configured to rotatably support the drive shaft; a body portion continuous with the bearing portion and extending radially outward; a pressing portion provided radially outside the body portion to press the casing; a supporting portion extending from a face of the body portion near the fixed scroll in an axial direction toward the fixed scroll; and a weld portion welded to the casing, an end face of the supporting portion near the fixed scroll is a fastening face to which the fixed scroll is fastened, a gap is formed between an inner peripheral surface of the casing and outer peripheral surfaces of the body portion and the supporting portion, an axial length of the gap is greater than or equal to an axial length from the end face of the supporting portion near the fixed scroll to the face of the body portion near the fixed scroll, at least part of the pressing portion and at least part of the weld portion are arranged side by side in a circumferential direction of the casing, and the weld portion communicates with an internal space of the casing through the gap.