PROBLEM TO BE SOLVED: To provide a wood preservative not only exhibiting high antifungal effects on fungi, but also having high antiseptic properties to wood, and to provide a method for preserving the wood by precisely controlling the fungi causing the decay of the wood in high efficiency to reduce the decay.SOLUTION: The wood preservative contains a compound represented by general formula (I) (wherein, R1 and R2 are the same or different and each a hydrogen atom, a halogen atom or a halogenated alkoxy group, with the proviso that the case in which both of the R1 and R2 are hydrogen is excluded R3 is an alkyl group R4 is a hydrogen atom or a group represented by the formula: -CH2CH2- obtained by binding the R3 and R4 and -NA is an aromatic heterocyclic group which may have a substituent, and which contains three or four nitrogen atoms) as an active ingredient.COPYRIGHT: (C)2008,JPO&INPIT【課題】カビ類に対して高い防カビ効果を示すとともに、木材に対して高い防腐性を有する防腐用木材保存剤を提供する。また、木材の腐敗を招くカビ類を確実かつ効率良く防除して腐朽を抑制する木材保存方法を提供する。【解決手段】一般式(I):(式中、R1及びR2は同一又は異なって水素原子、ハロゲン原子又はハロゲン化アルコキシ基を示し、R1及びR2がともに水素原子の場合を除く。R3はアルキル基、R4は水素原子を示し、或いはR3とR4とが結合した式:-CH2CH2-で示される基を示し、-NAは置換基を有してもよい3又は4個の窒素原子を含む芳香族複素環基を示す。)で表される化合物を有効成分として含む木材保存剤。【選択図】なし