The present invention provides a novel oxime ether derivative represented by the following formula (I), or salt thereof, that can be industrially produced advantageously, and can function as a fungicide for agricultural and horticultural use that has reliable effects and can be used safely, and a fungicide for agricultural and horticultural use that contains at least one of these compounds as an active ingredient thereof. In addition, the present invention provides a novel ketone derivative that is a production intermediate of the oxime ether derivative.
