The endoscope apparatus includes a movement amount calculation unit 340 that calculates a relative movement amount that is a relative movement amount between the imaging unit 200 and the subject, and a focus control unit 350 that performs focus control of the imaging unit 200. The focus control unit 350 obtains an accumulated motion amount obtained by accumulating the relative motion amount for N frames (N is a natural number of 3 or more (including that value)), and determines whether the accumulated motion amount is larger than the first threshold value. In-focus necessity determination processing is performed, and when it is determined that the accumulated motion amount is larger than the first threshold value, the focusing operation of the imaging unit 200 is executed.内視鏡装置は、撮像部２００と被写体との相対的な動き量である相対動き量を算出する動き量算出部３４０と、撮像部２００のフォーカス制御を行うフォーカス制御部３５０と、を含む。フォーカス制御部３５０は、相対動き量をＮフレーム（Ｎは３以上（その値を含む）の自然数）累積した累積動き量を求め、累積動き量が第１の閾値よりも大きいか否かを判定する合焦必要判定処理を行い、累積動き量が第１の閾値よりも大きいと判定された場合に、撮像部２００の合焦動作を実行する。
