A scroll compressor, comprising: a fixed scroll having a fixed wrap; and an orbiting scroll having an orbiting wrap engaged with the fixed wrap to form compression chambers, and performing an orbital motion with respect to the fixed scroll, wherein the fixed wrap and the orbiting wrap have a first constant section which is formed as an involute curve and where a wrap thickness is constant, a variable section which is formed as an involute curve and where a wrap thickness is increased from a suction side toward a discharge side, and a second constant section which is formed as an involute curve and where a wrap thickness is constant, wherein the first constant section, the variable section and the second constant section are consecutively formed in a direction from a wrap final end at the suction side to a wrap initial end at the discharge side, wherein the first constant section is from the wrap final end to a predetermined crank angle, the variable section is from an end of the first constant section to a predetermined crank angle, and the second constant section is from an end of the variable section to the wrap initial end, wherein the wrap thickness of the first constant section is smaller than that of the second constant section, wherein a wrap thickness of the variable section is continuously increased along an entire length of the section of the scroll between the first constant section and the second constant section, wherein an outside surface of the variable section is formed as a first involute curve and an inside surface of the variable section is formed as a second involute curve, and wherein the first involute curve and the second involute curve are formed by the involute curve having the same basic circle center and different basic circle radiuses from each other. a fixed scroll having a fixed wrap; and an orbiting scroll having an orbiting wrap engaged with the fixed wrap to form compression chambers, and performing an orbital motion with respect to the fixed scroll, wherein the fixed wrap and the orbiting wrap have a first constant section which is formed as an involute curve and where a wrap thickness is constant, a variable section which is formed as an involute curve and where a wrap thickness is increased from a suction side toward a discharge side, and a second constant section which is formed as an involute curve and where a wrap thickness is constant, wherein the first constant section, the variable section and the second constant section are consecutively formed in a direction from a wrap final end at the suction side to a wrap initial end at the discharge side, wherein the first constant section is from the wrap final end to a predetermined crank angle, the variable section is from an end of the first constant section to a predetermined crank angle, and the second constant section is from an end of the variable section to the wrap initial end, wherein the wrap thickness of the first constant section is smaller than that of the second constant section, wherein a wrap thickness of the variable section is continuously increased along an entire length of the section of the scroll between the first constant section and the second constant section, wherein an outside surface of the variable section is formed as a first involute curve and an inside surface of the variable section is formed as a second involute curve, and wherein the first involute curve and the second involute curve are formed by the involute curve having the same basic circle center and different basic circle radiuses from each other.