A high strength thin steel sheet having high hydrogen embrittlement resisting property and high workability, which comprises: C: higher than 0.3 up to 0.60%; Si: 1.0 to 3.0%; Mn: 1.0 to 3.5%; P: 0.15% or less; S: 0.02% or less; Al: 0.2 to 1.5 %; Cu: 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 element 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 after stretch forming operation with elongation of 3% consists of: residual austenite: 3% by area or more in proportion to the entire structure; binary phase of bainitic ferrite and marterisite 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: higher than 0.3 up to 0.60%; Si: 1.0 to 3.0%; Mn: 1.0 to 3.5%; P: 0.15% or less; S: 0.02% or less; Al: 0.2 to 1.5 %; Cu: 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 element 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 after stretch forming operation with elongation of 3% consists of: residual austenite: 3% by area or more in proportion to the entire structure; binary phase of bainitic ferrite and marterisite 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 marterisite 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. 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.