Abstract: The present invention relates to alkyl phenyl ether derivatives of the formula (I) ##SPC1##(wherein Y represents methyl radical or chlorine atom, R represents an alkyl having from 1 to 8 carbon atoms, n is an integer of 0, 1 or 2); said compounds are manufactured by condensing, if necessary in the presence of an alkaline compound, a compound expressed by the formula (II) ##SPC2##(wherein Y and n have the same meanings as defined hereinbefore, M represents hydrogen atom or an alkali metal atom.) with a compound expressed by the formula (III)x -- r (iii)(wherein X represents a halogen atom and R has the same meaning as defined hereinbefore). Said new compounds have an acaricidal effect, therefore, the compounds are used as acaricide.