Cyclic amine compound represented by formula (I) or salt thereof: ** Formula ** in formula (I), Cy1 and Cy2 independently represent a C6-C10 aryl group or a heterocyclyl group； R1a, R1b, R2a, R2b, R3a, R3b, R4a, R4b and R5a independently represent a hydrogen atom or an unsubstituted or substituted C1-6 alkyl group； R1a and R2a, or R3a and R4a are linked together to form an unsubstituted or substituted C3-6 alkylene group, an unsubstituted or substituted C3-6 alkenylene group, a group represented by the formula: -CH2OCH2-, a group represented by the formula: -CH2SCH2-, a group represented by the formula: -CH2C (>； = O) CH2-, or a group represented by the formula: -CH2NR6CH2-, (with the proviso that R6 represents a hydrogen atom , an unsubstituted or substituted C1-6 alkyl group, an unsubstituted or substituted C1-7 acyl group or an unsubstituted or substituted C1-6-carbonyl alkoxy group)； R10, R11, R20 and R21 independently represent an unsubstituted or substituted C1-6 alkyl group, an unsubstituted or substituted C3-8 cycloalkyl group, an unsubstituted or substituted C2-6 alkenyl group, a C2 alkynyl group -6 unsubstituted or substituted, a hydroxy group, an oxo group, an unsubstituted or substituted C1-6 alkoxy group, an unsubstituted or substituted C3-8 cycloalkoxy group, an unsubstituted C2-6-oxy alkenyl group or substituted, an unsubstituted or substituted C2-6-oxy alkynyl group, a carboxyl group, an unsubstituted or substituted C1-7 acyl group, an unsubstituted or substituted C1-6 alkoxycarbonyl group, a C3-8 cycloalkyl group - unsubstituted or substituted oxycarbonyl, an unsubstituted or substituted C2-6-oxycarbonyl alkenyl group, an unsubstituted or substituted C2-6-oxycarbonyl alkynyl group, an unsubstituted or substituted aryl C6-10-oxycarbonyl group, a non-substituted heterocyclyloxycarbonyl group substituted or substituted, a C1-7-oxy acyl group not its substituted or substituted, an unsubstituted or substituted C1-6-oxycarbonyloxy group, an unsubstitute
