The object of the present invention is to provide an intraoral massage device which has a good usability to be able to be applied to multiple movements, such as pushing or rubbing various parts in the oral cavity. The intraoral massage device 1 includes a long grip portion 10 and a massage portion 12 formed of an elastic body extending from the tip of the grip portion 10. The massage part 12 has an action part 13 to be inserted into the oral cavity near the front end, and the total length L of the massage part 12 is 60.0 to 110.0 mm. The action part 13 has a rounded tip part 14； a front part 18 of the massage part 12 is swollen, and if the length of the action portion 13 in the side view is defined as LA(mm) and the width of the rear end 14a of the front end portion 14 where the width expansion ends in the front view is define as dB(mm), LA/dBis 1.7 to 6.0.本發明的目的在於提供一種可應對按壓、或摩擦口腔內的各種部分的多個動作的、使用性優異的口腔內按摩器、以及包括所述口腔內按摩器的口腔內按摩套組。一種口腔內按摩器1，包括長條的握持部10、以及自握持部10的前端延伸出的作為彈性體的按摩部12，按摩部12於靠近前端處具有插入口腔內而發揮作用的作用部13，按摩部12的總長L為60.0 mm～110.0 mm，按摩部12具有帶有圓潤感的前端部分14，且正面部分18呈曲面狀鼓出，並且將側視時的作用部13的長度設為LA（mm）、將正視時寬度的擴大結束的前端部分14的後端14a的寬度設為dB（mm）時，LA/dB為1.7～6.0。
