A memory card adaptor is provided herein. The memory card adaptor may include a housing having a slot configured to accommodate a memory card. The memory card may include a signal terminal and non-signal terminals. For example, the signal terminal may be a high-speed and/or data transfer terminal, and the non-signal terminal may be a power or voltage terminal. The signal terminal may be at least partially exposed via a signal terminal opening in the housing when the memory card is accommodated in the slot. The memory card adaptor may also include at least one card-side terminal arranged so as to be capable of contacting at least one of the non-signal terminals. The at least one card-side terminal may be electrically connected, for example via a wiring line, to at least one socket-side terminal arranged so as to be capable of contacting terminals of a host socket