A carbon fiber-reinforced resin composition, comprising: 100 parts by mass of a polymer alloy which comprises: 25 to 95 % by mass of one or more propylene-based polymers (p) selected from a propylene-ethylene block copolymer, a propylene homopolymer and a propylene-ethylene random copolymer having an ethylene content of 5 % by mass or less, 1 to 60 % by mass of an acid-modified polyolefin resin (m), 0 to 40 % by mass of an ethylene-based polymer (e) and 0 to 50 % by mass of a polyamide (n) wherein the total of the component (p), the component (m), the component (e) and the component (n) is 100 % by mass, and 1 to 200 parts by mass of a carbon fiber, the acid-modified polyolefin resin (m) is a maleic acid-modified propylene-based polymer, or a maleic acid-modified propylene-based polymer and a maleic acid-modified ethylene-based polymer; the total of Wp and Wm is 50 to 100 % by mass, Wn is 0 to 50 % by mass, and the ratio of Wp and Wm (Wp/Wm) is 70/30 to 98/2, in which the content of the component (p) is expressed by Wp % by mass, the content of the component (m) is expressed by Wm % by mass, the content of the component (e) is expressed by We % by mass, and the content of the component (n) is expressed by Wn % by mass in the polymer alloy, and the total of Wp, Wm, We and Wn is 100 % by mass; and, the following formula is satisfied in which the content of the component (p) is expressed by Wp % by mass, the content of the component is expressed by Wm1 % by mass (the content of the whole component (m) is expressed by Wm % by mass), the total of Wp, Wm, We and Wn is 100 % by mass, the melt flow rate of the component (p) measured at 230°C under a load of 2.16 kg according to ASTM D1238 is expressed by MFRp (g/10 min) and the melt flow rate of the component measured at 230°C under a load of 2.16 kg according to ASTM D1238 is expressed by MFR m1 (g/10 min): Q p × log MF R p + Q m 1 × log MF R m 1 > log 120 wherein, Q p = W p / W p + W m 1, Q m 1 = W m 1 / W p + W m 1 100 parts by mass of a polymer alloy which comprises: 25 to 95 % by mass of one or more propylene-based polymers (p) selected from a propylene-ethylene block copolymer, a propylene homopolymer and a propylene-ethylene random copolymer having an ethylene content of 5 % by mass or less, 1 to 60 % by mass of an acid-modified polyolefin resin (m), 0 to 40 % by mass of an ethylene-based polymer (e) and 0 to 50 % by mass of a polyamide (n) wherein the total of the component (p), the component (m), the component (e) and the component (n) is 100 % by mass, and 25 to 95 % by mass of one or more propylene-based polymers (p) selected from a propylene-ethylene block copolymer, a propylene homopolymer and a propylene-ethylene random copolymer having an ethylene content of 5 % by mass or less, 1 to 60 % by mass of an acid-modified polyolefin resin (m), 0 to 40 % by mass of an ethylene-based polymer (e) and 0 to 50 % by mass of a polyamide (n) wherein the total of the component (p), the component (m), the component (e) and the component (n) is 100 % by mass, and 1 to 200 parts by mass of a carbon fiber, the acid-modified polyolefin resin (m) is a maleic acid-modified propylene-based polymer, or a maleic acid-modified propylene-based polymer and a maleic acid-modified ethylene-based polymer; the total of Wp and Wm is 50 to 100 % by mass, Wn is 0 to 50 % by mass, and the ratio of Wp and Wm (Wp/Wm) is 70/30 to 98/2, in which the content of the component (p) is expressed by Wp % by mass, the content of the component (m) is expressed by Wm % by mass, the content of the component (e) is expressed by We % by mass, and the content of the component (n) is expressed by Wn % by mass in the polymer alloy, and the total of Wp, Wm, We and Wn is 100 % by mass; and, the following formula is satisfied in which the content of the component (p) is expressed by Wp % by mass, the content of the component is expressed by Wm1 % by mass (the content of the whole component (m) is expressed by Wm % by mass), the total of Wp, Wm, We and Wn is 100 % by mass, the melt flow rate of the component (p) measured at 230°C under a load of 2.16 kg according to ASTM D1238 is expressed by MFRp (g/10 min) and the melt flow rate of the component measured at 230°C under a load of 2.16 kg according to ASTM D1238 is expressed by MFR m1 (g/10 min): Q p × log MF R p + Q m 1 × log MF R m 1 > log 120 wherein, Q p = W p / W p + W m 1, Q m 1 = W m 1 / W p + W m 1