The automatic control-type, portable instillation apparatus is constituted by (a) a pressurizing bag means for holding an infusion liquid bag to pressurize it; (b) an air pump for supplying a pressurizing air to a pressurizing bag; (c) a pressure sensor for detecting pressure in the pressurizing bag; (d) a drop counter mounted to a drip tube for counting the dropping of an infusion liquid; (e) a clamp device mounted to the infusion liquid tube for controlling the amount of the infusion liquid flowing therethrough; and (f) a control means receiving an output of the pressure sensor and / or the drop counter for comparing (i) the measured pressure of the pressurizing bag means with reference pressure, and (ii) the measured drop count with the reference drop count, thereby generating a signal for controlling the air pump and / or the clamp device. The air pump is operated and / or the clamp device opens the infusion liquid tube when the measured pressure is lower than a reference pressure, and / or when the measured drop count is smaller than a reference drop count. The air pump is stopped and / or the clamp device clamps the infusion liquid tube when the measured pressure is equal to or higher than the reference pressure, and / or when the measured drop count is equal to or larger than the reference drop count. Thus, the dropping speed of the infusion liquid is kept substantially constant.
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