A height adjustable stand for musical instrument includes a connecting housing including a sleeve secured to the stand, a bifurcation extending out of the sleeve and including a top opening communicating with a slot therein, and two limit surfaces on both sides of the opening respectively; two opposite hooks each pivotably secured to the bifurcation and including a coupling member including a spring receptacle, a lever, an inclined surface adjacent to the receptacle, and a latch, and a curved member extending from the coupling member; a torsion spring biased between the spring receptacles; and a lock pivotably supported in the opening and including a first part, a second part at an angle with respect to the first part, and a protrusion on a bottom of the first part. Pressing of the first part moves the protrusion out of the slot to unlock the hooks.