conjunction
therefore; because of this; for this reason
Formal or literary conjunction used to state a conclusion or result based on the preceding context. Often found in written arguments, speeches, or formal explanations.
彼は十分な証拠を提出した。この故に、彼の主張は認められた。
He submitted sufficient evidence. Therefore, his claim was accepted.
この故に、我々は計画の見直しを提案する。
For this reason, we propose a review of the plan.
だから is the common, everyday equivalent. この故に is more formal and literary, often used in written or structured discourse.
それ故に is also formal but refers back to a previous statement more abstractly, while この故に emphasizes the immediate reason just mentioned.
Compound of この (this) + 故 (reason/cause) + に (particle indicating basis). The phrase literally means 'for this reason'.