Today, breast cancer is one of the leading causes of cancer deaths, especially in women, as it is a life-threatening type of cancer that is most frequently diagnosed in women worldwide, rarely seen in men. Most deaths from breast cancer are not caused by the tumor itself, but by metastasis to other organs in the body. Therefore, as in all cancer types, early diagnosis of breast cancer can reduce the incidence of metastatic disease and prolong disease-free and survival time. Breast ultrasonography, mammography, breast MRI, positron emission tomography and fine needle biopsy techniques are the most commonly used and the most effective techniques in the diagnosis of breast cancer. However, these methods are limited because they are costly to set up, some methods are painful for the patient, and are not suitable for all ages. Recently, electrochemical methods have become very common because they are fast, sensitive, selective, low-cost, easily prepared and interpreted devices. Accordingly, biosensors are preferred more and more day by day. In this review, it is aimed to summarize the biosensor studies designed for the detection of biomarkers used in the early-stage diagnosis of breast cancer.