A chest-developing exerciser is disclosed to include a retractable main shaft, a wheel pivotally provided at the bottom end of the main shaft, two handlebars respectively coupled to the top end of the main shaft at two sides, a support bar pivotally connected to a middle part of the main shaft, two foot bars bilaterally provided at the bottom end of the support bar remote from the main shaft, two holder frames respectively fixedly provided at the main shaft and the support bar, and spring members connected between the holder frames.