Disclosed are a bracket apparatus applicable to a keyboard, and a keyboard comprising the bracket apparatus. The bracket apparatus comprises a shell, wherein: a support plate is hinged to the shell through a hinge shaft, a releasably-connected support shaft being disposed between a free end of the support plate and the shell, a torsion spring being sleeved onto the hinge shaft, two ends of the torsion spring being respectively connected to the shell and the support plate; and the shell is further provided with a push switch with a built-in spring apparatus, a locking bump being disposed on the push switch, a locking mating bump mating with the locking bump being disposed on a side portion of the support plate. The bracket apparatus has the advantages of simple operations and convenient in use.