Foldable stroller

A foldable stroller comprising:

• a stroller body including a frame member and an armrest pivotably joined to the frame member, the stroller body being capable of being folded from an unfolded state to a folded state;
• a back part frame joined to the stroller body for supporting a back part of a seat to be mounted on the stroller body, the back part frame being pivotable with respect to the stroller body about an axis line whose relative position with respect to the frame member is constant during a folding action of the stroller body;
• and
• a support member joined to the armrest and to the back frame part so as to connect the armrest and the back part frame with each other, the support member having a flexibility so as to allow the back part frame to be pivoted with respect to the stroller body within a predetermined range;
• wherein the support member is positioned such that the back part frame is pivoted with respect to the stroller body, in conjunction with a pivoting movement of the armrest with respect to the frame member during the folding action of the stroller body.