The invention provides a pitch inhibitor, etc. which can be extensively applied to paper production steps regardless of substances causative of pitch or the pitch situation and with which it is possible to effectively inhibit or prevent the occurrence of pitch troubles such as paper stains, defects, breakage, and a decrease in workability. The pitch inhibitor comprises either an alkali solution in which a phenolic resin and/or a modified phenolic resin has been dissolved or an acid solution in which a phenolic resin and/or a modified phenolic resin has been dissolved.