Importance

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Abstract

The present invention provides a shock absorber serving as a cylinder device capable of securing a clearance between an outer tube and a peripheral member and improving bending rigidity of the outer tube. An outer tube 104 housing an inner tube 103 is provided with a pair of knuckle bracket fastening plates 110a and 110b protruding in one direction from an outer surface of the outer tube 104. The pair of knuckle bracket fastening plates 10a and 110b has wide surfaces facing each other, and the wide surfaces are provided along an axial direction of the outer tube 104. When the inside of a vehicle is defined as a virtual region I 192 and the outside of the vehicle is defined as a virtual region II 193 with a virtual line 191, which passes through a stroke center line 71 and matches the inside and outside of the vehicle, as a boundary in an orthogonal cross section at an arbitrary axial position of the outer tube 104 orthogonal to the stroke center line 71 of a piston rod 102, a cross-sectional area A_i1 of the outer tube 104 in the virtual region I 192 is made larger than a cross-sectional area A_o1 of the outer tube 104 in the virtual region II 193.

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First Claim