An electronic keyboard instrument which enables an instrument frame to be shared by different types of electronic keyboard instruments, and facilitates separate mounting and removal of a keyboard unit and a tone-generating unit. A frame assembly (FAS) has a pair of left and right frame bodies (LFM and RFM) and upper and lower connecting members (20AS and 30AS). The frame assembly is configured such that the two frame bodies are connected together via the connecting members. A pair of keyboard unit-holding parts (16La and 16Ra) are provided respectively on the two frame bodies of the frame assembly. The keyboard unit-holding parts are capable of selectively holding one of a plurality of types of keyboard units (KB). A pair of speaker unit-holding parts (17La and 17Ra) are provided respectively on the two frame bodies, separately from the keyboard unit-holding parts. The speaker unit-holding parts are capable of selectively holding one of a plurality of types of speaker units (SP).