  Using the VOID FINDER algorithm we have compiled a catalogue of voids in the
IRAS 1.2-Jy sample. The positions of the voids correspond well to underdense
regions seen in the IRAS smoothed density map. However, since in our analysis
no smoothing is used, all structures appear much sharper: walls are not smeared
and the voids are not artificially reduced by them. Therefore the current
method based on the galaxy point distribution is better suited to determine the
diameter of voids in the galaxy distribution. We have identified 24 voids,
covering more than 30% of the volume considered. By comparing the results with
equivalent random catalogues we have determined that 12 voids are significant
at a 0.95 confidence level, having an average diameter of 40+-6 h^{-1} Mpc. Our
results serve not only for charting the cosmography of the nearby Universe, but
also to give support to the results recently obtained with the SSRS2 sample,
suggesting a void-filled Universe. Moreover, our results indicate that the
voids detected have a similar scale, demonstrating that both optically and
IRAS-selected galaxies delineate the same large-scale structures.
