We present results of underreporting estimation for daily series of PCR+ or clinical diagnosis counts for Islas Baleares. By May 10, 2020 the number of confirmed cases is 2050 and the reconstruction of our model gave 3556 cases. This means that there are 1506 or 73.4% of non-reported cases with respect to the observed. Below you see the daily counts series (Fig.1) and the cummulative counts series (Fig. 2), observed versus estimated.