A high strength thin steel sheet having high hydrogen embrittlement resisting property, which comprises: C: 0.10 to 0.25%; Si: 1.2 to 2.5%; Mn: 1.2 to 3.5%; P: 0.15% or less; S: 0.02% or less; Al: 0.2 to 1.5%; which optionally further comprises C: 0.003 to 0.5% and/or Ni: 0.003 to 1.0% as optional elements, Ti and/or V: 0.003 to 1.0% as optional elements, Mo: 1.0% or less (higher than 0%) and Nb: 0.1% or less (higher than 0%) as optional elements, B: 0.0002 to 0.01% as an optional element, at least one e)e-ment selected from the group consisting of: Ca: 0.0005 to 0.005%, Mg: 0.0005 to 0.01% and REM: 0.0005 to 0.01% as optional elements, and Zr: 0.003 to 1.0% as an optional element, in terms of percentage by weight, with balance of iron and inevitable impurities; wherein the metal structure consists of: residual austenite: 3% by area or more in proportion to the entire structure; binary phase of bainitic ferrite and martensite with the bainitic ferrite acting as the main phase: 90% or more in total, while the mean axis ratio (major axis/minor axis) of said residual austenite grains is 5 or higher, and the steel has tensile strength of 1180 MPa or higher, wherein the metal structure further satisfies the requirements that: mean length of minor axes of said residual austenite grains is 1 μm or less; and minimum distance between said residual austenite grains is 1 μm or less. C: 0.10 to 0.25%; Si: 1.2 to 2.5%; Mn: 1.2 to 3.5%; P: 0.15% or less; S: 0.02% or less; Al: 0.2 to 1.5%; which optionally further comprises C: 0.003 to 0.5% and/or Ni: 0.003 to 1.0% as optional elements, Ti and/or V: 0.003 to 1.0% as optional elements, Mo: 1.0% or less (higher than 0%) and Nb: 0.1% or less (higher than 0%) as optional elements, B: 0.0002 to 0.01% as an optional element, at least one e)e-ment selected from the group consisting of: Ca: 0.0005 to 0.005%, Mg: 0.0005 to 0.01% and REM: 0.0005 to 0.01% as optional elements, and Zr: 0.003 to 1.0% as an optional element, in terms of percentage by weight, with balance of iron and inevitable impurities; wherein the metal structure consists of: residual austenite: 3% by area or more in proportion to the entire structure; binary phase of bainitic ferrite and martensite with the bainitic ferrite acting as the main phase: 90% or more in total, while the mean axis ratio (major axis/minor axis) of said residual austenite grains is 5 or higher, and the steel has tensile strength of 1180 MPa or higher, wherein the metal structure further satisfies the requirements that: mean length of minor axes of said residual austenite grains is 1 μm or less; and minimum distance between said residual austenite grains is 1 μm or less. residual austenite: 3% by area or more in proportion to the entire structure; binary phase of bainitic ferrite and martensite with the bainitic ferrite acting as the main phase: 90% or more in total, while the mean axis ratio (major axis/minor axis) of said residual austenite grains is 5 or higher, and the steel has tensile strength of 1180 MPa or higher, wherein the metal structure further satisfies the requirements that: mean length of minor axes of said residual austenite grains is 1 μm or less; and minimum distance between said residual austenite grains is 1 μm or less.