An input apparatus capable of improving detection sensitivity in detecting operations using a capacitive sensing method. An operation member is operated to change the positional relationship between a substrate and a conducive member. In the conductive member, a first part whose facing area facing an earth electrode of the substrate does not change even when the positional relationship between the substrate and the conducive member changes, and second parts whore facing area facing detecting electrodes of the substrate changes in response to a change in the positional relationship between the substrate and the conducive member are formed. The substrate or the conducive member is formed so that when the facing area of the second parts facing the detecting electrodes reaches the maximum, the facing area of the second parts facing the detecting electrodes can be equal to the facing area of the first part facing the earth electrode.