<；P>；PROBLEM TO BE SOLVED: To provide a nonionic surfactant which comprises a dimer diol alkylene oxide derivative and is excellent in a surface-active ability, and to provide a cosmetic which is good in a slipping touch and the compatibility with a skin, when coated on the skin. <；P>；SOLUTION: This nonionic surfactant comprises an alkylene oxide derivative represented by the following formula (I): Z-äO-[(AO)<；SB>；a<；/SB>；-(EO)<；SB>；b<；/SB>；]-H}<；SB>；2<；/SB>；(wherein, Z is a residue formed by removing hydroxy groups from a dimer diol； EO is oxyethylene group； AO is 3 or 4C oxyalkylene group and comprises at least a 4C oxyalkylene group； the form of the addition of AO and EO is a block form； (a) and (b) are the average addition moles of the oxyalkylene groups and the oxyethylene groups, and are limitted by 1&le；2×；a&le；70, and 1&le；2×；b&le；150, and the rate of the oxyethylene groups on the basis of the total amount of the oxyethylene groups and the oxyalkylene groups is 20 to 95 mass%). <；P>；COPYRIGHT: (C)2009,JPO&INPIT
