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A folding baby carriage comprises a pair of seating surface supporting side bars extending back and forth along both sides of a seating surface in order to support the seating surface from beneath. Each seating surface supporting side bar has a rigid inward extending portion extending toward the in

A folding baby carriage comprises a pair of seating surface supporting side bars extending back and forth along both sides of a seating surface in order to support the seating surface from beneath. Each seating surface supporting side bar has a rigid inward extending portion extending toward the inside so as to support the seating surface from beneath, at a rear portion thereof. The inward extending portion is formed by bending a rear end portion of the seating surface supporting side bar toward the inside.

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What is claimed is: 1. A folding baby carriage that is foldable from an opened state to a folded state so as to be reduced in dimension in a width direction, comprising a pair of seating surface supporting side bars and a seating surface member mounted and supported on said side bars, wherein each

What is claimed is: 1. A folding baby carriage that is foldable from an opened state to a folded state so as to be reduced in dimension in a width direction, comprising a pair of seating surface supporting side bars and a seating surface member mounted and supported on said side bars, wherein each one of said side bars respectively includes a side bar portion extending back and forth along a respective side of said seating surface member and supporting said seating surface member from beneath, wherein each one of said side bars respectively further includes a rigid inward extending portion extending from a rear portion of said side bar laterally inwardly in said width direction toward the other one of said side bars and supporting said seating surface member from beneath, and wherein said rigid inward extending portions respectively terminate laterally inwardly at respective unsupported free distal ends that are not connected to each other, and said rigid inward extending portions have a lateral space therebetween in said width direction in said opened state. 2. The folding baby carriage according to claim 1, wherein said inward extending portions are respectively integral unitary portions of said side bars integrated with said side bar portions. 3. The folding baby carriage according to claim 1, wherein each one of said inward extending portions is respectively formed by bending a rear end portion of a respective one of said seating surface supporting side bars laterally inwardly in the shape of a horseshoe. 4. The folding baby carriage according to claim 1, further comprising: a rear leg having a rear wheel; an inverting member that is turnably connected to said rear leg through a connection pin, and that is located along said rear leg above said connection pin in said opened state, and that is located along said rear leg below said connection pin in said folded state; and a connection member turnably connected to said inverting member; wherein said seating surface supporting side bar and said connection member are fixed, and a portion of said seating surface supporting side bar extending backward beyond said connection member is bent in the shape of a horseshoe to form said inward extending portion. 5. The folding baby carriage according to claim 1, wherein said lateral space between said pair of inward extending portions in said opened state has a dimension corresponding to a distance in which said pair of seating surface supporting side bars approach each other in accordance with a folding operation from said opened state to said folded state. 6. The folding baby carriage according to claim 1, wherein said seating surface member comprises a plate-shaped seating surface core connected to said pair of seating surface supporting side bars. 7. The folding baby carriage according to claim 6, wherein said seating surface core is connected to said inward extending portions of said pair of seating surface supporting side bars. 8. The folding baby carriage according to claim 6, wherein said seating surface core and said pair of seating surface supporting side bars are connected through a belt. 9. The folding baby carriage according to claim 6, further comprising a bending link member connecting front portions of said pair of seating surface supporting side bars, wherein said bending link member has a center link bar and a pair of side link bars provided so as to allow said bending link member to be bent, and said seating surface core is further connected to said center link bar.