The purpose of the research is to develop a valid and reliable measurement tool that will determine the philosophical attitudes and behaviors of pre-school children. For this purpose, firstly the literature of philosophy and pre-school education were reviewed and then the opinions of 11 experts were taken and the items were rearranged in line with the feedbacks. The checklist was applied to 200 children attending the kindergarten of primary schools located in the district of Keçiören in the province of Ankara. As a result of the analyses, 4 of the 33 items (9, 14, 19 and 25 items) were excluded from the checklist for the reason that the item discrimination index was below 0,30. Item discrimination indices and point double-range correlation coefficients for items were reexamined in the 29-item checklist. As a result of the analyzes made, it is seen that the items are at the level of difficulty that can be found in the checklist and are distinguishable at medium and high level. In addition, when the point double-range correlation coefficients are examined, it is concluded that the correlation values are acceptable. The internal consistency of the checklist for determining the philosophical attitudes and behaviors of pre-school children was calculated with KR-20 and the KR-20 score was 0.90. In this context, the reliability of the test is very high in terms of internal consistency. When the item difficulties were deemed as homogeneous, it was determined that the reliability coefficient of KR-21 calculated as 0,89 was high. When the control list is divided into equivalent halves and the reliability coefficient of the equivalence halves calculated using the Sperman-Brown correction formula for the reliability coefficient related to the correlation value between these halves is found to be highly reliable with 0,85. Checklist for Determining Philosophical Attitudes and Behaviors of Preschool Children, consisting of 29 items and answered with yes/no, is found to be a valid reliable measurement tool