The purpose of the present invention is to provide a pregnancy time period forecasting device, pregnancy time period forecasting method, and pregnancy time period forecasting program, whereby a time period to a pregnancy is forecast with a user's individual situation being accounted for. Provided is a pregnancy time period forecasting device, comprising: a feature vector computation unit 11 which, on the basis of first survey data which includes results of a survey which is carried out on a plurality of persons who have experienced pregnancy, computes a plurality of feature vectors which correspond respectively to the plurality of persons who have experienced pregnancy; a user feature vector computation unit 13 which, on the basis of second survey data which includes results of a survey which is carried out on a user, computes a user feature vector which corresponds to the user; an extraction unit 14 which extracts, from the plurality of feature vectors, one or a plurality of similar vectors which are similar to the user feature vector; and a forecasting unit 15 which, on the basis of a time period which one or a plurality of the persons who have experienced pregnancy who correspond to the one or the plurality of similar vectors required to become pregnant, computes a forecast value of the time period until the user becomes pregnant.
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