A foot massager includes a base, two support portions, two foot contact portions, a plurality of massage elements, and a controller. The supporting parts are assembled on the base, and each supporting part can move relative to each other. The sole contact portions are respectively mounted on one of the supporting portions, and each sole contact portion includes a plurality of assembly holes. The plurality of massage elements are optionally installed in a part of the assembling hole, and protrude from the surface of the foot contact portion after assembling. The controller is electrically connected with the support part, the sole contact part, and the massage element, and is used for driving the two support parts to move relatively and start the vibration of the massage element. With the support portion and a plurality of assembly holes, the distance between the sole contact portions can be adjusted to conform to the posture of the user, and the position of the massage element can be adjusted to meet the needs of each user, which is in accordance with ergonomic design.一種腳底按摩器,包含底座、二支持部、二腳底接觸部、複數個按摩元件、以及控制器。支持部組接於底座上,各支持部可相對於彼此移動。二腳底接觸部分別裝設於支持部之一上,各腳底接觸部包含複數個組裝孔。複數個按摩元件可選擇地裝設於組裝孔的一部分中,並在組裝後突出於腳底接觸部的表面。控制器電性連接支持部、腳底接觸部、及按摩元件,用以驅動二支持部相對移動及啟動按摩元件振動。藉由支持部及複數個組裝孔,腳底接觸部之間的距離可以調整來符合使用者的姿勢,也能調整按摩元件的位置,而符合每個使用者的需求,合乎人體工學設計。