A chemical protective suit comprising: a head portion for covering the part of a human body extending from the top of the head to the neck, a body portion for covering the part of a human body extending from the chest to the abdomen, a pair of arm portions for covering the parts of a human body extending from the shoulders to the wrists, a pair of leg portions for covering the parts of a human body extending from the abdomen to the calves, and a pair of foot portions for covering the parts of a human body extending from the calves to the toes, the aforementioned portions being integrated into a unitary body by integrating a plurality of sheet fabric pieces (7, 8, 9), characterized in that each of the foot portions comprises a sheet fabric piece forming a sole and a heel and a sheet fabric piece forming an instep which are adjacent and integrated with each other, and the integrated portion of each pair of adjacent sheet fabric pieces (8, 9) in each of the foot portions comprises a seam line extending along peripheral edges (8a, 8b, 8c, 9a) of two adjacent sheet fabric pieces (8, 9) stacked on each other, with the peripheral edges (8a, 8b, 8c, 9a) opposed to each other, and a welded portion of the stacked sheet fabric pieces (8, 9) of a predetermined breadth extending along the seam line, with the peripheral edges (8a, 8b, 8c, 9a) and the welded portion disposed to face opposite sides of the seam line, wherein the integrated portion of each pair of adjacent sheet fabric pieces (8, 9) in each of the foot portions is exposed to the external air, and wherein the sheet fabric piece forming a sole and a heel is folded along a single symmetry axis and the portions of the sheet fabric piece forming a sole and a heel close to the peripheral edges (8a and 8b) of the heel are stacked on each other, with the peripheral edges (8a and 8b) of the heel opposed to each other, a portion of the sheet fabric piece forming an instep close to peripheral edge of the instep is stacked on a portion of the sheet fabric piece forming a sole and a heel close to the peripheral edge of the sole, with the peripheral edge of the instep and the peripheral edge of the sole opposed to each other, and the portions stacked on each other are integrated. a head portion for covering the part of a human body extending from the top of the head to the neck, a body portion for covering the part of a human body extending from the chest to the abdomen, a pair of arm portions for covering the parts of a human body extending from the shoulders to the wrists, a pair of leg portions for covering the parts of a human body extending from the abdomen to the calves, and a pair of foot portions for covering the parts of a human body extending from the calves to the toes, the aforementioned portions being integrated into a unitary body by integrating a plurality of sheet fabric pieces (7, 8, 9), characterized in that each of the foot portions comprises a sheet fabric piece forming a sole and a heel and a sheet fabric piece forming an instep which are adjacent and integrated with each other, and the integrated portion of each pair of adjacent sheet fabric pieces (8, 9) in each of the foot portions comprises a seam line extending along peripheral edges (8a, 8b, 8c, 9a) of two adjacent sheet fabric pieces (8, 9) stacked on each other, with the peripheral edges (8a, 8b, 8c, 9a) opposed to each other, and a welded portion of the stacked sheet fabric pieces (8, 9) of a predetermined breadth extending along the seam line, with the peripheral edges (8a, 8b, 8c, 9a) and the welded portion disposed to face opposite sides of the seam line, wherein the integrated portion of each pair of adjacent sheet fabric pieces (8, 9) in each of the foot portions is exposed to the external air, and wherein the sheet fabric piece forming a sole and a heel is folded along a single symmetry axis and the portions of the sheet fabric piece forming a sole and a heel close to the peripheral edges (8a and 8b) of the heel are stacked on each other, with the peripheral edges (8a and 8b) of the heel opposed to each other, a portion of the sheet fabric piece forming an instep close to peripheral edge of the instep is stacked on a portion of the sheet fabric piece forming a sole and a heel close to the peripheral edge of the sole, with the peripheral edge of the instep and the peripheral edge of the sole opposed to each other, and the portions stacked on each other are integrated.