A method of obtaining a hot pressed steel material by providing a zinc-based plated steel sheet comprising: a zinc-based plated steel sheet that is a base metal; and a surface treatment layer formed on at least one surface of the zinc-based plated steel sheet, wherein, before hot pressing, the surface treatment layer consists of one or more compounds selected from the group consisting of magnesium oxide, magnesium chloride, magnesium nitrate and magnesium sulfate, and a resin, and optionally at least one of one or more phosphorus-containing compounds, one or more vanadium-containing compounds, one or more aluminum-containing compounds, one or more silicon-containing compounds, and one or more chromium-containing compounds in the following range as the contained amount per one surface, and optionally at least one of zirconia, lanthanum oxide, cerium oxide, neodymium oxide, titanium oxide, nickel oxide, tin oxide, pigment or anti-rust pigment, a crosslinker, the one or more phosphorus-containing compounds: not less than 0.0 g/m 2 and not more than 0.01 g/m 2 on a P basis, the one or more vanadium-containing compounds: not less than 0.0 g/m 2 and not more than 0.01 g/m 2 on a V basis, the one or more aluminum-containing compounds: not less than 0.0 g/m 2 and not more than 0.005 g/m 2 on an Al basis, the one or more silicon-containing compounds: not less than 0.0 g/m 2 and not more than 0.005 g/m 2 on a Si basis, and the one or more chromium-containing compounds: not less than 0.0 g/m 2 and not more than 0.01 g/m 2 on a Cr basis, the amount of the one or more compounds selected from the group consisting of magnesium oxide, magnesium chloride, magnesium nitrate and magnesium sulfate is not less than 0.2 g/m 2 and not more than 5.0 g/m 2 per one surface on a magnesium oxide basis, and performing hot pressing on said zinc-based plated steel sheet, wherein said zinc-based plated steel sheet is heated to 700 to 1000°C, and is then press-molded. a zinc-based plated steel sheet that is a base metal; and a surface treatment layer formed on at least one surface of the zinc-based plated steel sheet, wherein, before hot pressing, the surface treatment layer consists of one or more compounds selected from the group consisting of magnesium oxide, magnesium chloride, magnesium nitrate and magnesium sulfate, and a resin, and optionally at least one of one or more phosphorus-containing compounds, one or more vanadium-containing compounds, one or more aluminum-containing compounds, one or more silicon-containing compounds, and one or more chromium-containing compounds in the following range as the contained amount per one surface, and optionally at least one of zirconia, lanthanum oxide, cerium oxide, neodymium oxide, titanium oxide, nickel oxide, tin oxide, pigment or anti-rust pigment, a crosslinker, the one or more phosphorus-containing compounds: not less than 0.0 g/m 2 and not more than 0.01 g/m 2 on a P basis, the one or more vanadium-containing compounds: not less than 0.0 g/m 2 and not more than 0.01 g/m 2 on a V basis, the one or more aluminum-containing compounds: not less than 0.0 g/m 2 and not more than 0.005 g/m 2 on an Al basis, the one or more silicon-containing compounds: not less than 0.0 g/m 2 and not more than 0.005 g/m 2 on a Si basis, and the one or more chromium-containing compounds: not less than 0.0 g/m 2 and not more than 0.01 g/m 2 on a Cr basis, the amount of the one or more compounds selected from the group consisting of magnesium oxide, magnesium chloride, magnesium nitrate and magnesium sulfate is not less than 0.2 g/m 2 and not more than 5.0 g/m 2 per one surface on a magnesium oxide basis, and