A memory device having heterogeneous terminals easily connects the memory device to a computer or a portable terminal without a specific gender. When a memory unit is connected to a computer, the memory unit slides out of the body and the first terminal of the memory unit is inserted into a USB connector of the computer, and when the memory unit is connected to a portable terminal, the connection unit slides out of the body and the second terminal of the connection unit is inserted in a mini-USB connector of the portable terminal, so it is possible to easily connect the memory unit to the portable terminal without a specific gender.