26 there are also ic memory cards capacitances resistances etc and according to the position of the contact elements 20 21 pluralities of small round holes are arranged on the base plate 26 in order to implement better combination the third row contact elements 22 are combined with the base plate 26 through the pins extending upwards from the base frame 24 thus signals can be transmitted this is the prior art and it is not discussed here also as shown in fig5 it is the diagram of an embodiment of a card switch device supporting insertion of different types of memory cards according to the present invention in fig5 the base frame 24 of the present invention further comprises a top shell 14 and a bottom shell 16 for covering the card switch device 10 obviously besides the third row contact elements 22 the present invention provides a row pins set as marked with circle in fig 5 because the exterior size of the sd mmc card is similar to the ms duo card in the sizes i e the row pins set can be arranged around the position where the second row pins set of fig1 fig4 is to attain the same efficacy and object in conclusion the card switch device of the present invention has at least the following advantages and efficacy 1 the switch device of the cf card interface according to the present invention can support insertion and access of different types of standard memory cards which are inserted at different times through a single groove 2 according to the present invention the single groove is arranged to hold the different types of memory.