The present invention relates to a peptide comprising any one of the following formulas (I) to (III): (I) (X1) [D] P [D] (X2) [D] X1 represents W or F, X2 represents S or T, and each amino acid symbol immediately followed by the symbol [D] represents the D form of the amino acid.), (II) P [D] T [D] (X) amino acid sequence of nF [D] (wherein (X) n represents n arbitrary amino acids selected independently of each other, n represents an integer of 0-4, and the symbol [D] And (III) an amino acid sequence that is a retro-inverso of any one of the amino acid sequences of (I) or (II); and a conjugate comprising the peptide and a functional moiety .本発明は、下記式(I)-(III)のいずれかのアミノ酸配列を含むペプチド:(I)(X1)[D]P[D](X2)[D]のアミノ酸配列(該配列中、X1はWまたはFを示し、X2はSまたはTを示し、直後に記号[D]を付した各アミノ酸記号は該アミノ酸のD体を示す。)、(II)P[D]T[D](X)nF[D]のアミノ酸配列(該配列中、(X)nは互いに独立して選択されるn個の任意のアミノ酸を示し、nは0-4の整数を示し、記号[D]は前記と同義を示す。)、(III)前記(I)または(II)のいずれかのアミノ酸配列のRetro-inversoであるアミノ酸配列;および該ペプチドと機能性部分とを含むコンジュゲートを提供する。