FIBROUS CELLULOSE， FIBROUS CELLULOSE-CONTAINING SUBSTANCE， MOLDED BODY， AND METHOD FOR PRODUCING FIBROUS CELLULOSE

The present invention addresses the problem of providing a fibrous cellulose which has a phosphorus oxoacid group and which exhibits excellent heat resistance. The present invention relates to a fibrous cellulose containing a phosphoric acid group and a phosphorus acid group. In addition， the present invention relates to a method for producing a fibrous cellulose， the method including a step for mixing a cellulose raw material with a phosphoric acid group-containing compound and/or a salt thereof， a phosphorus acid group-containing compound and/or a salt thereof， and urea and/or a urea derivative so as to obtain a cellulose raw material having a phosphoric acid group and a phosphorus acid group.