Diafragmatic injury presents acutely and be associated with other life threatening injury of other organs. Sudden increase in abdominal pressure may cause injury in the membranous or muscular part of the diaphragm. While isolated diaphragmatic rupture after blunt trauma is rarely seen, its diagnosis can be overlooked frequently. Early diagnosis is the most important step in the treatment. Cases with delayed diagnosis can result in a diaphragmatic hernia with high mortality and morbidity rates due to complications such as strangulation and incarceration. The most critical point during the diagnosis is the suspicion for clinical diaphragm injury. X-ray graphy and computed tomography can be a guide for identifying diaphragmatic injuries. In this case report we presented an isolated left side diaphragmatic rupture after blunt abdominal trauma and treated with an urgent surgical operation.