Formula (I) (wherein, each independently, R 2 and .R 1 that represents a hydrogen atom, an alkyl group or the like C1~20 together, the present invention, a substituted or unsubstituted R 1 and R 2 each independently, good .R 3 ~R 6 and R 6 and R 5 and R 5 .R 4 that represents a hydrogen atom, an alkyl C1~20 group or the like to form a 5-8 membered ring having a group is .n to a halogen atom such as an oxygen atom .Z indicating an integer of 0 to 4 good .X to become respectively together can also form a 5 to 8 membered ring with an unsubstituted or substituted I to a salt thereof and a nitrogen-containing heterocyclic compound and / or represented by.) indicating the like. In addition, to provide agricultural and horticultural fungicide containing as an active ingredient at least one of these.本発明は、式(I)(式中、R1及びR2は夫々独立して、水素原子、C1~20アルキル基等を示す。R1とR2は一緒になって、無置換若しくは置換基を有する5~8員環を形成してもよい。R3~R6は夫々独立して、水素原子、C1~20アルキル基等を示す。R4とR5及びR5とR6は夫々一緒になって、無置換若しくは置換基を有する5~8員環を形成してもよい。Xはハロゲン原子等を示す。nは0~4のいずれかの整数を示す。Zは酸素原子等を示す。)で表される含窒素複素環化合物及び/又はその塩を提供する。また、これらの少なくとも1種を有効成分として含有する農園芸用殺菌剤を提供する。
