A multilayer tube, which comprises two or more layers containing a layer (a) and a layer (b); wherein the layer (a) contains an aliphatic polyamide composition (A); the layer (b) contains a modified polyolefin (B); the aliphatic polyamide composition (A) contains a polyamide (A1) and an elastomer polymer (A2); the polyamide (A1) is an aliphatic polyamide having a ratio of a number of methylene groups to a number of amide groups of 7.0 or more, and is contained in the aliphatic polyamide composition (A) in an amount of 70 mass% or more and 90 mass% or less; the elastomer polymer (A2) has a constituent unit derived from an unsaturated compound having a carboxyl group and/or an acid anhydride group, and is contained in the aliphatic polyamide composition (A) in an amount of 5 mass% or more and 30 mass% or less; the aliphatic polyamide composition (A) may contain a plasticizer (A3); the plasticizer (A3) has no sulfur atom, and has an ester structure of p- and/or o-hydroxybenzoic acid and a linear and/or branched alkylaliphatic alcohol having alcohol having a carbon atom number of 12 to 24, and the content of the plasticizer (A3) in the aliphatic polyamide composition (A) is 0 mass% or more and 15 mass% or less; the aliphatic polyamide composition (A) has a bending elastic modulus of 400 MPa or more and 1,000 MPa or less as measured in compliance with ISO 178; the modified polyolefin (B) has a unit derived from a monomer based on an α-olefin having a carbon atom number of 2 to 10, and has a melting point of 130°C or more as measured in compliance with ISO 11357-3; in the multilayer tube, the layer (a) and the layer (b) are arranged in the order from the outside to the inside of the multilayer tube; and the thickness of the layer (a) occupies 60% or more of the total thickness of the tube. the layer (a) contains an aliphatic polyamide composition (A); the layer (b) contains a modified polyolefin (B); the aliphatic polyamide composition (A) contains a polyamide (A1) and an elastomer polymer (A2); the polyamide (A1) is an aliphatic polyamide having a ratio of a number of methylene groups to a number of amide groups of 7.0 or more, and is contained in the aliphatic polyamide composition (A) in an amount of 70 mass% or more and 90 mass% or less; the elastomer polymer (A2) has a constituent unit derived from an unsaturated compound having a carboxyl group and/or an acid anhydride group, and is contained in the aliphatic polyamide composition (A) in an amount of 5 mass% or more and 30 mass% or less; the aliphatic polyamide composition (A) may contain a plasticizer (A3); the plasticizer (A3) has no sulfur atom, and has an ester structure of p- and/or o-hydroxybenzoic acid and a linear and/or branched alkylaliphatic alcohol having alcohol having a carbon atom number of 12 to 24, and the content of the plasticizer (A3) in the aliphatic polyamide composition (A) is 0 mass% or more and 15 mass% or less; the aliphatic polyamide composition (A) has a bending elastic modulus of 400 MPa or more and 1,000 MPa or less as measured in compliance with ISO 178; the modified polyolefin (B) has a unit derived from a monomer based on an α-olefin having a carbon atom number of 2 to 10, and has a melting point of 130°C or more as measured in compliance with ISO 11357-3; in the multilayer tube, the layer (a) and the layer (b) are arranged in the order from the outside to the inside of the multilayer tube; and the thickness of the layer (a) occupies 60% or more of the total thickness of the tube. <EOS>