PROBLEM TO BE SOLVED: To provide a medicament for the treatment or prevention of fibrosing of tissues and diseases caused by fibrosing of tissues, and to provide a treatment and/or prevention method using the medicament.SOLUTION: The medicament for the treatment and/or prevention of fibrosing of tissues and diseases caused by fibrosing of tissues contains a substituted diphenyl methanoic acid derivative represented by formula (1) or its salt or their solvates, or their hydrates as an effective component. In the formula, X represents -C(R1R2)- or a sulfur atom R1 and R2 are the same or different and each represent a straight chain 3-6C D represents a tert-butyl group, an adamantyl group, a phenyl group, a 1-naphthyl group a 2-naphthyl group a 2,4,6-trimethyl phenyl group C(CH3)2(CH2)nPh group (here, n is 1-3) A represents -CH2CH(OH)CH2OH or -(CH2)mCOOH (here, m is 1-5) B and C may be mutually different or the same and represent either hydrogen or a methyl group and E represents a hydroxyl group or an oxo group.COPYRIGHT: (C)2013,JPO&INPIT【課題】本発明は、組織の線維化及び組織の線維化によって引き起こされる疾患の治療及び/又は予防のための医薬の提供、並びに、該医薬を使用した治療及び/又は予防方法の提供を目的とする。【解決手段】一般式(1)で表される置換ジフェニルメタン酸誘導体若しくはその塩又はそれらの溶媒和物若しくはそれらの水和物を有効成分として含む、組織の線維化及び組織の線維化によって引き起こされる疾患の治療及び/又は予防用医薬組成物。【選択図】なし