Acylguanidine derivative or salt thereof

An acylguanidine derivative represented by the following general formula (I) or a pharmaceutically acceptable salt thereof

• symbols in the formula represent the following meanings
• R1 and R2:
• the same or different from each other, and each represents lower alkyl which may be substituted, lower alkenyl, halogen, —CN, —NO2, —OR0, —O-halogeno-lower alkyl, —OC(O)R0, —NR0R0a, —NR0—C(O)R0a, —NR0—S(O)2R0a, —SH, —S(O)p-lower alkyl, —S(O)2—NR0R0a, —C(O)R0, —CO2R0, —C(O)NR0R0a, cycloalkyl, aryl or a hetero ring group, wherein the aryl and a hetero ring group in R1 and R2 may respectively be substituted,
• R0 and R0a:
• the same or different from each other, and each represents —H or lower alkyl,
• m, n and p:
• the same or different from one another and each is 0, 1 or 2,
• X:
• —N(R5)—,
• Y:
• a single bond,
• R5:
• —H, lower alkyl which may be substituted, —C(O)R0, —CO2R0, —C(O)NR0R0a, —S(O)p-lower alkyl, —S(O)p-aryl, cycloalkyl, a hetero ring group, lower alkylene-cycloalkyl, lower alkylene-aryl, lower alkylene-hetero ring group,
• —C(O)-aryl or —C(O)-hetero ring group,
• wherein the aryl and a hetero ring group in R5 may be respectively substituted, and
• ring A:
• benzene ring.