Peptide fragment(s) having an activity of inhibiting cell death which contain the amino acid sequence consisting of 103 amino acid residues in the C-terminal side of selenoprotein P, an amino acid sequence derived from the above amino acid sequence by deletion, substitution or addition of one or several amino acids therein, or a partial sequence of either of the above amino acid sequences; remedies containing the above peptide fragment(s); antibodies against the above peptide fragment(s); and a method for screening a cell death inhibitory activity with the use of the above peptide fragment(s). Preferable examples of the above peptide fragment(s) are those containing the amino acid sequence(s) represented by SEQ ID NO:1 and/or 2 or partial sequences thereof.