A crosstalk removing device for use in a recorded information reproducing apparatus which is free from malfunctions even if a read sample value sequence, which has been read from a recording medium and sampled, is out of synchronization, and can immediately proceed to a crosstalk removing operation after the read sample value sequence recovers the synchronization. When crosstalk from adjacent tracks is removed from the read sample value sequence, which has been read from a recording medium and sampled, to produce a crosstalk removed read sample sequence, filter coefficients are derived for converging an error value present in the crosstalk removed read sample value sequence to zero, and the read sample value sequence is filtered on the basis of the filter coefficients to derive crosstalk components from the adjacent tracks. The crosstalk components are subtracted from the read sample value sequence to derive the crosstalk removed read sample value sequence. In this event, when the read sample value sequence remains in an asynchronous state, the read sample value sequence is filtered on the basis of predetermined fixed coefficient values instead of the filter coefficient to derive crosstalk components from the adjacent tracks.