A hot pressed member comprising: a chemical composition consisting of, in mass%, C: 0.090 % or more and less than 0.30 %, Mn: 3.5 % or more and less than 11.0 %, Si: 0.01 % to 2.5 %, P: 0.05 % or less, S: 0.05 % or less, Al: 0.005 % to 0.1 %, N: 0.01 % or less, optionally one or more groups selected from A group: one or more selected from Ni: 0.01 % to 5.0 %, Cu: 0.01 % to 5.0 %, Cr: 0.01 % to 5.0 %, and Mo: 0.01 % to 3.0 %, B group: one or more selected from Ti: 0.005 % to 3.0 %, Nb: 0.005 % to 3.0 %, V: 0.005 % to 3.0 %, and W: 0.005 % to 3.0 %, C group: one or more selected from REM: 0.0005 % to 0.01 %, Ca: 0.0005 % to 0.01 %, and Mg: 0.0005 % to 0.01 %, D group: Sb: 0.002 % to 0.03 %, and E group: B: 0.0005 % to 0.05 %, with a balance being Fe and incidental impurities; a first region having: a microstructure including a martensite phase of 80.0 % or more in volume fraction and a retained austenite phase of 3.0 % or more and 20.0 % or less in volume fraction; a tensile property of 1500 MPa or more in tensile strength TS and 6.0 % or more in uniform elongation uEl; and a dislocation density of 1.0 × 10 16 /m 2 or more; and a second region having: a microstructure including a ferrite phase of 30.0 % or more and 60.0 % or less in volume fraction, a retained austenite phase of 10.0 % or more and 70.0 % or less in volume fraction, and a martensite phase of 30.0 % or less in volume fraction; and a tensile property of 780 MPa or more in tensile strength TS and 15.0 % or more in uniform elongation uEl, wherein, in the microstructure in the second region, a mean grain size of the ferrite phase is 10 μm or less, a mean grain size of a secondary phase is 10 μm or less, and Mns/Mnα is 1.5 or more, where Mns is a Mn concentration in the secondary phase and Mnα is a Mn concentration in the ferrite phase, and the secondary phase is the balance other than the ferrite. a chemical composition consisting of, in mass%, C: 0.090 % or more and less than 0.30 %, Mn: 3.5 % or more and less than 11.0 %, Si: 0.01 % to 2.5 %, P: 0.05 % or less, S: 0.05 % or less, Al: 0.005 % to 0.1 %, N: 0.01 % or less, optionally one or more groups selected from A group: one or more selected from Ni: 0.01 % to 5.0 %, Cu: 0.01 % to 5.0 %, Cr: 0.01 % to 5.0 %, and Mo: 0.01 % to 3.0 %, B group: one or more selected from Ti: 0.005 % to 3.0 %, Nb: 0.005 % to 3.0 %, V: 0.005 % to 3.0 %, and W: 0.005 % to 3.0 %, C group: one or more selected from REM: 0.0005 % to 0.01 %, Ca: 0.0005 % to 0.01 %, and Mg: 0.0005 % to 0.01 %, D group: Sb: 0.002 % to 0.03 %, and E group: B: 0.0005 % to 0.05 %, with a balance being Fe and incidental impurities; a first region having: a microstructure including a martensite phase of 80.0 % or more in volume fraction and a retained austenite phase of 3.0 % or more and 20.0 % or less in volume fraction; a tensile property of 1500 MPa or more in tensile strength TS and 6.0 % or more in uniform elongation uEl; and a dislocation density of 1.0 × 10 16 /m 2 or more; and a second region having: a microstructure including a ferrite phase of 30.0 % or more and 60.0 % or less in volume fraction, a retained austenite phase of 10.0 % or more and 70.0 % or less in volume fraction, and a martensite phase of 30.0 % or less in volume fraction; and a tensile property of 780 MPa or more in tensile strength TS and 15.0 % or more in uniform elongation uEl, wherein, in the microstructure in the second region, a mean grain size of the ferrite phase is 10 μm or less, a mean grain size of a secondary phase is 10 μm or less, and Mns/Mnα is 1.5 or more, where Mns is a Mn concentration in the secondary phase and Mnα is a Mn concentration in the ferrite phase, and the secondary phase is the balance other than the ferrite.