Introduction: The present study examined the confidence in essential medical practices during clinical clerkship (CC) and performance in preparing education for medical students who are just starting CC at our university.Methods: We conducted a survey using questionnaires with 105 fourth-year medical students just before starting CC. This questionnaire analysis consists of the confidence in objective structured clinical examination (OSCE) and computer-based testing (CBT) performance toward essential medical practice recommended in the "Report on Medical Practice during Clinical Clerkship" by the Japanese Ministry of Health, Labor, and Welfare and medical safety for CC.Results: The response rate was 67.6% (71/105). As for the performance in each OSCE theme, the confidence in basic clinical technique was significantly smaller compared to chest or abdominal examination, medical interview, and emergency response (p<0.05 each). Medical interviews showed stronger confidence compared to gynecological, breast, or rectal examinations and prostate palpitation among medical examinations (p<0.05 each). In the basic technique during CC, skin disinfection showed stronger confidence compared to other techniques (p<0.05 each). On surgical technique during CC, surgical hand washing and gown technique significantly showed stronger confidence compared to skin suture, suture removal, bleeding control, and surgical assistant (p<0.05 each). Conclusion: Our results suggest that medical students just before CC have less confidence in invasive medical practice during CC. As medical practice by student doctors becomes public, further systematic basic skill training both before and during CC is warranted.