A clad steel plate comprising: a base steel plate; and a cladding metal made of a corrosion-resistant alloy bonded or joined to one surface of the base steel plate, wherein the base steel plate has a chemical composition containing, in mass%, C: 0.020 % to 0.100 %, Si: 0.05 % to 0.50 %, Mn: 0.75 % to 1.80 %, P: 0.015 % or less, S: 0.0030 % or less, Al: 0.010 % to 0.070 %, Nb: 0.005 % to 0.080 %, Ti: 0.005 % to 0.030 %, and N: 0.0010 % to 0.0060 %, optionally at least one selected from Cu: 0.50 % or less, Cr: 0.50 % or less, Mo: 0.50 % or less, V: 0. 100 % or less, Ni: 0.50 % or less, or Ca: 0.0040 % or less with the balance being Fe and inevitable impurities; the base steel plate has a steel microstructure where an average grain diameter of the bainite is 25 μm or less; and an interface between the base steel plate and the cladding metal bonded or joined together has a shear strength of 300 MPa or more, wherein the average grain diameter of the bainite is measured in accordance with the specifics given in the description and the shear strength is measured in accordance with JISG0601, wherein the corrosion-resistant alloy is a Ni-based alloy of Alloy 625 or of Alloy 825 or an austenitic stainless steel, characterized in that the base steel plate has a steel microstructure where, at a 1/2 plate thickness position in a thickness direction of the base steel plate, an area ratio of bainite is 94 % or more, and an area ratio of martensite austenite constituent is 6 % or less. the base steel plate has a chemical composition containing, in mass%, C: 0.020 % to 0.100 %, Si: 0.05 % to 0.50 %, Mn: 0.75 % to 1.80 %, P: 0.015 % or less, S: 0.0030 % or less, Al: 0.010 % to 0.070 %, Nb: 0.005 % to 0.080 %, Ti: 0.005 % to 0.030 %, and N: 0.0010 % to 0.0060 %, optionally at least one selected from Cu: 0.50 % or less, Cr: 0.50 % or less, Mo: 0.50 % or less, V: 0. 100 % or less, Ni: 0.50 % or less, or Ca: 0.0040 % or less with the balance being Fe and inevitable impurities; C: 0.020 % to 0.100 %, Si: 0.05 % to 0.50 %, Mn: 0.75 % to 1.80 %, P: 0.015 % or less, S: 0.0030 % or less, Al: 0.010 % to 0.070 %, Nb: 0.005 % to 0.080 %, Ti: 0.005 % to 0.030 %, and N: 0.0010 % to 0.0060 %, optionally at least one selected from Cu: 0.50 % or less, Cr: 0.50 % or less, Mo: 0.50 % or less, V: 0. 100 % or less, Ni: 0.50 % or less, or Ca: 0.0040 % or less with the balance being Fe and inevitable impurities; the base steel plate has a steel microstructure where an average grain diameter of the bainite is 25 μm or less; and an interface between the base steel plate and the cladding metal bonded or joined together has a shear strength of 300 MPa or more, wherein the average grain diameter of the bainite is measured in accordance with the specifics given in the description and the shear strength is measured in accordance with JISG0601, wherein the corrosion-resistant alloy is a Ni-based alloy of Alloy 625 or of Alloy 825 or an austenitic stainless steel, characterized in that the base steel plate has a steel microstructure where, at a 1/2 plate thickness position in a thickness direction of the base steel plate, an area ratio of bainite is 94 % or more, and an area ratio of martensite austenite constituent is 6 % or less. <EOS>