To provide an attachment component for suppressing oscillation of an electronic card when a narrow electronic card is connected and preventing dust from intruding through the opening part of an electronic card connection device when the electronic card is connected with respect to the electronic card connection device having a wide opening part.

The attachment component 6 includes a first member 62 and a second member 64. The first member 62 is stored in a space part inside the electronic connection device 1 formed when the narrow electronic card 44 is connected to a connector of the electronic card connection device 1. Also, the first member 62 stored in the space part is almost as wide as the space part.

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