A hot-rolled steel sheet, comprising: C: 0.05 mass% to 0.45 mass%; Si: 0.5 mass% to 3.0 mass%; Mn: 0.50 mass% to 3.60 mass%; P: 0.030 mass% or less; S: 0.010 mass% or less; Al: 0.005 mass% to 1.5 mass%; N: 0.010 mass% or less; O: 0.010 mass% or less; Ti: 0 mass% to 0.150 mass%; Nb: 0 mass% to 0.150 mass%; V: 0 mass% to 0.150 mass%; B: 0 mass% to 0.010 mass%; Mo: 0 mass% to 1.00 mass%; W: 0 mass% to 1.00 mass%; Cr: 0 mass% to 2.00 mass%; Ni: 0 mass% to 2.00 mass%; Cu: 0 mass% to 2.00 mass%; a total of one kind or two kinds or more selected from a group consisting of Ca, Ce, Mg, Zr, Hf, and REM: 0 mass% to 0.500 mass%; and the balance: iron and impurities, wherein: a Si/Mn ratio of steel material components of a base material of the steel sheet is not less than 0.27 nor more than 0.90 in mass ratio; an internal oxide layer having a thickness of not less than 1 μ m nor more than 30 μ m is provided right below an oxide scale of a steel sheet surface layer portion; and an internal oxide in a crystal grain of the internal oxide layer is an oxide containing Si and having a thickness of not less than 10 nm nor more than 200 nm in a crystal grain in a range of greater than 0% and 30% or less of a thickness of the internal oxide layer from an interface between the internal oxide layer and base iron toward a direction of the surface layer oxide scale, one or more branches of the internal oxide exist in a cross section of 1 μ m × 1 μ m square, and in any crystal grain boundary having a length of 1 μ m, one or more of the internal oxides are connected to an internal oxide of the crystal grain boundary to form a net-like structure, and wherein in the internal oxide layer, an oxide (Fe x, Mn 1-x) 2 SiO 4 (0 ≦ x < 1) and an amorphous SiO 2 exist. C: 0.05 mass% to 0.45 mass%; Si: 0.5 mass% to 3.0 mass%; Mn: 0.50 mass% to 3.60 mass%; P: 0.030 mass% or less; S: 0.010 mass% or less; Al: 0.005 mass% to 1.5 mass%; N: 0.010 mass% or less; O: 0.010 mass% or less; Ti: 0 mass% to 0.150 mass%; Nb: 0 mass% to 0.150 mass%; V: 0 mass% to 0.150 mass%; B: 0 mass% to 0.010 mass%; Mo: 0 mass% to 1.00 mass%; W: 0 mass% to 1.00 mass%; Cr: 0 mass% to 2.00 mass%; Ni: 0 mass% to 2.00 mass%; Cu: 0 mass% to 2.00 mass%; a total of one kind or two kinds or more selected from a group consisting of Ca, Ce, Mg, Zr, Hf, and REM: 0 mass% to 0.500 mass%; and the balance: iron and impurities, wherein: a Si/Mn ratio of steel material components of a base material of the steel sheet is not less than 0.27 nor more than 0.90 in mass ratio; an internal oxide layer having a thickness of not less than 1 μ m nor more than 30 μ m is provided right below an oxide scale of a steel sheet surface layer portion; and an internal oxide in a crystal grain of the internal oxide layer is an oxide containing Si and having a thickness of not less than 10 nm nor more than 200 nm in a crystal grain in a range of greater than 0% and 30% or less of a thickness of the internal oxide layer from an interface between the internal oxide layer and base iron toward a direction of the surface layer oxide scale, one or more branches of the internal oxide exist in a cross section of 1 μ m × 1 μ m square, and in any crystal grain boundary having a length of 1 μ m, one or more of the internal oxides are connected to an internal oxide of the crystal grain boundary to form a net-like structure, and wherein in the internal oxide layer, an oxide (Fe x, Mn 1-x) 2 SiO 4 (0 ≦ x < 1) and an amorphous SiO 2 exist. a Si/Mn ratio of steel material components of a base material of the steel sheet is not less than 0.27 nor more than 0.90 in mass ratio; an internal oxide layer having a thickness of not less than 1 μ m nor more than 30 μ m is provided right below an oxide scale of a steel sheet surface layer portion; and an internal oxide in a crystal grain of the internal oxide layer is an oxide containing Si and having a thickness of not less than 10 nm nor more than 200 nm in a crystal grain in a range of greater than 0% and 30% or less of a thickness of the internal oxide layer from an interface between the internal oxide layer and base iron toward a direction of the surface layer oxide scale, one or more branches of the internal oxide exist in a cross section of 1 μ m × 1 μ m square, and in any crystal grain boundary having a length of 1 μ m, one or more of the internal oxides are connected to an internal oxide of the crystal grain boundary to form a net-like structure, and wherein in the internal oxide layer, an oxide (Fe x, Mn 1-x) 2 SiO 4 (0 ≦ x < 1) and an amorphous SiO 2 exist.