Structure for an electronic keyboard instrument includes upper and lower
cases. The lower case has a bottom plate having lower slits, and the
upper case has an upper plate having upper slits. The upper and lower
cases are fastened together with the upper case overlapped on the lower
case and with opposite edge portions of a circuit board inserted in the
lower and upper slits in such a manner that the circuit board is disposed
upright between the upper and lower cases. Heat radiating plate is
attached to the circuit board. A wiring, drawn out from an operation
section provided on the upper case, is wired to pass across a
neighborhood of the upper end surface of the heat radiating plate under
the lower surface of the upper plate. Heat blocking plate is provided
between the heat radiating plate and the wiring to block transfer of heat
from the heat radiating plate to the wiring.