Abstract: Separated IO type dynamic memory device includes a write data bus for transmitting data to be written into a selected memory cell and a read data bus for transferring data read out from a selected memory cell. The write data bus and the read data bus are separately provided from each other. The memory device further includes a load circuit for supplying a current flow to the read data bus and for precharging the read data bus to a predetermined potential, and drive circuits provided for each pair of bit lines each connecting memory cells of a column for driving the read data bus to a potential corresponding to potentials appearing on an associated pair of bit lines in response to a column select signal. The memory device further includes an insulated gate type transistor inserted on the read data bus between the loading circuit and the driving circuits and receives a predetermined intermediate potential at the gate.