A stroller comprises a foldable stroller frame including two handle tubes, two front leg tubes connected respectively to lower ends of the handle tubes, and two rear leg tubes connected respectively and pivotally to the front leg tubes. Each of the handle tubes has upper and lower handle tube sections interconnected pivotally by a first joint. Each of the front leg tubes has upper and lower front leg tube sections interconnected pivotally by a second joint. Each of the lower handle tube sections is connected pivotally to the upper front leg tube section of the corresponding front leg tube and the corresponding rear leg tube by a third joint. Upon folding the stroller frame, an assembly of the handle tubes and the front leg tubes is folded in a Z-shaped manner.